diff --git a/src/ast.cpp b/src/ast.cpp
index 943168e73..681f059b4 100644
--- a/src/ast.cpp
+++ b/src/ast.cpp
@@ -511,6 +511,25 @@ namespace Sass {
   /////////////////////////////////////////////////////////////////////////
   /////////////////////////////////////////////////////////////////////////
 
+  Expression::Expression(ParserState pstate, bool d, bool e, bool i, Type ct)
+  : AST_Node(pstate),
+    is_delayed_(d),
+    is_expanded_(e),
+    is_interpolant_(i),
+    concrete_type_(ct)
+  { }
+
+  Expression::Expression(const Expression* ptr)
+  : AST_Node(ptr),
+    is_delayed_(ptr->is_delayed_),
+    is_expanded_(ptr->is_expanded_),
+    is_interpolant_(ptr->is_interpolant_),
+    concrete_type_(ptr->concrete_type_)
+  { }
+
+  /////////////////////////////////////////////////////////////////////////
+  /////////////////////////////////////////////////////////////////////////
+
   Unary_Expression::Unary_Expression(ParserState pstate, Type t, Expression_Obj o)
   : Expression(pstate), optype_(t), operand_(o), hash_(0)
   { }
diff --git a/src/ast.hpp b/src/ast.hpp
index 30282e842..6718296c8 100644
--- a/src/ast.hpp
+++ b/src/ast.hpp
@@ -80,7 +80,7 @@ namespace Sass {
       case LT: return "lt";
       case LTE: return "lte";
       case ADD: return "plus";
-      case SUB: return "sub";
+      case SUB: return "minus";
       case MUL: return "times";
       case DIV: return "div";
       case MOD: return "mod";
@@ -198,21 +198,7 @@ namespace Sass {
     ADD_PROPERTY(bool, is_interpolant)
     ADD_PROPERTY(Type, concrete_type)
   public:
-    Expression(ParserState pstate,
-               bool d = false, bool e = false, bool i = false, Type ct = NONE)
-    : AST_Node(pstate),
-      is_delayed_(d),
-      is_expanded_(e),
-      is_interpolant_(i),
-      concrete_type_(ct)
-    { }
-    Expression(const Expression* ptr)
-    : AST_Node(ptr),
-      is_delayed_(ptr->is_delayed_),
-      is_expanded_(ptr->is_expanded_),
-      is_interpolant_(ptr->is_interpolant_),
-      concrete_type_(ptr->concrete_type_)
-    { }
+    Expression(ParserState pstate, bool d = false, bool e = false, bool i = false, Type ct = NONE);
     virtual operator bool() { return true; }
     virtual ~Expression() { }
     virtual bool is_invisible() const { return false; }
@@ -441,7 +427,6 @@ namespace Sass {
     ADD_PROPERTY(bool, group_end)
   public:
     Statement(ParserState pstate, Type st = NONE, size_t t = 0);
-    Statement(const Statement* ptr); // copy constructor
     virtual ~Statement() = 0; // virtual destructor
     // needed for rearranging nested rulesets during CSS emission
     virtual bool bubbles();
diff --git a/src/ast2c.cpp b/src/ast2c.cpp
index be9ea800f..6498c5d30 100644
--- a/src/ast2c.cpp
+++ b/src/ast2c.cpp
@@ -16,9 +16,12 @@ namespace Sass {
   union Sass_Value* AST2C::operator()(Custom_Error_Ptr e)
   { return sass_make_error(e->message().c_str()); }
 
-  union Sass_Value* AST2C::operator()(Color_Ptr c)
+  union Sass_Value* AST2C::operator()(Color_RGBA_Ptr c)
   { return sass_make_color(c->r(), c->g(), c->b(), c->a()); }
 
+  union Sass_Value* AST2C::operator()(Color_HSLA_Ptr c)
+  { return operator()(c->toRGBA()); }
+
   union Sass_Value* AST2C::operator()(String_Constant_Ptr s)
   {
     if (s->quote_mark()) {
diff --git a/src/ast2c.hpp b/src/ast2c.hpp
index 428791619..a1b2dee40 100644
--- a/src/ast2c.hpp
+++ b/src/ast2c.hpp
@@ -16,7 +16,8 @@ namespace Sass {
 
     union Sass_Value* operator()(Boolean_Ptr);
     union Sass_Value* operator()(Number_Ptr);
-    union Sass_Value* operator()(Color_Ptr);
+    union Sass_Value* operator()(Color_RGBA_Ptr);
+    union Sass_Value* operator()(Color_HSLA_Ptr);
     union Sass_Value* operator()(String_Constant_Ptr);
     union Sass_Value* operator()(String_Quoted_Ptr);
     union Sass_Value* operator()(Custom_Warning_Ptr);
diff --git a/src/ast_def_macros.hpp b/src/ast_def_macros.hpp
index 75bb6fcde..cfe489daa 100644
--- a/src/ast_def_macros.hpp
+++ b/src/ast_def_macros.hpp
@@ -74,6 +74,7 @@ public: \
   virtual klass##_Ptr clone(std::string, size_t) const = 0; \
 
 #define ATTACH_VIRTUAL_AST_OPERATIONS(klass) \
+  klass(const klass* ptr); \
   virtual klass##_Ptr copy(std::string, size_t) const override = 0; \
   virtual klass##_Ptr clone(std::string, size_t) const override = 0; \
 
@@ -89,6 +90,7 @@ public: \
   virtual klass##_Ptr clone() const = 0; \
 
 #define ATTACH_VIRTUAL_AST_OPERATIONS(klass) \
+  klass(const klass* ptr); \
   virtual klass##_Ptr copy() const override = 0; \
   virtual klass##_Ptr clone() const override = 0; \
 
diff --git a/src/ast_fwd_decl.cpp b/src/ast_fwd_decl.cpp
index c9c76727a..cd54fa240 100644
--- a/src/ast_fwd_decl.cpp
+++ b/src/ast_fwd_decl.cpp
@@ -19,6 +19,7 @@ namespace Sass {
   IMPLEMENT_BASE_CAST(Has_Block)
   IMPLEMENT_BASE_CAST(PreValue)
   IMPLEMENT_BASE_CAST(Value)
+  IMPLEMENT_BASE_CAST(Color)
   IMPLEMENT_BASE_CAST(List)
   IMPLEMENT_BASE_CAST(String)
   IMPLEMENT_BASE_CAST(String_Constant)
diff --git a/src/ast_fwd_decl.hpp b/src/ast_fwd_decl.hpp
index d68bedf5a..a66495985 100644
--- a/src/ast_fwd_decl.hpp
+++ b/src/ast_fwd_decl.hpp
@@ -166,6 +166,12 @@ namespace Sass {
   class Color;
   typedef Color* Color_Ptr;
   typedef Color const* Color_Ptr_Const;
+  class Color_RGBA;
+  typedef Color_RGBA* Color_RGBA_Ptr;
+  typedef Color_RGBA const* Color_RGBA_Ptr_Const;
+  class Color_HSLA;
+  typedef Color_HSLA* Color_HSLA_Ptr;
+  typedef Color_HSLA const* Color_HSLA_Ptr_Const;
   class Boolean;
   typedef Boolean* Boolean_Ptr;
   typedef Boolean const* Boolean_Ptr_Const;
@@ -321,6 +327,8 @@ namespace Sass {
   IMPL_MEM_OBJ(Variable);
   IMPL_MEM_OBJ(Number);
   IMPL_MEM_OBJ(Color);
+  IMPL_MEM_OBJ(Color_RGBA);
+  IMPL_MEM_OBJ(Color_HSLA);
   IMPL_MEM_OBJ(Boolean);
   IMPL_MEM_OBJ(String_Schema);
   IMPL_MEM_OBJ(String);
@@ -477,6 +485,7 @@ namespace Sass {
   DECLARE_BASE_CAST(PreValue)
   DECLARE_BASE_CAST(Value)
   DECLARE_BASE_CAST(List)
+  DECLARE_BASE_CAST(Color)
   DECLARE_BASE_CAST(String)
   DECLARE_BASE_CAST(String_Constant)
   DECLARE_BASE_CAST(Supports_Condition)
diff --git a/src/ast_selectors.hpp b/src/ast_selectors.hpp
index ee4c3a306..c8039dee5 100644
--- a/src/ast_selectors.hpp
+++ b/src/ast_selectors.hpp
@@ -50,7 +50,6 @@ namespace Sass {
     mutable size_t hash_;
   public:
     Selector(ParserState pstate);
-    Selector(const Selector* ptr);
     virtual ~Selector() = 0;
     size_t hash() const override = 0;
     virtual unsigned long specificity() const = 0;
@@ -115,7 +114,6 @@ namespace Sass {
     HASH_PROPERTY(bool, has_ns)
   public:
     Simple_Selector(ParserState pstate, std::string n = "");
-    Simple_Selector(const Simple_Selector* ptr);
     virtual std::string ns_name() const;
     size_t hash() const override;
     bool empty() const;
diff --git a/src/ast_values.cpp b/src/ast_values.cpp
index 633ec5ae4..ffcd27f86 100644
--- a/src/ast_values.cpp
+++ b/src/ast_values.cpp
@@ -210,7 +210,7 @@ namespace Sass {
   {
     return sass_op_to_name(optype());
   }
-  
+
   const std::string Binary_Expression::separator()
   {
     return sass_op_separator(optype());
@@ -221,7 +221,7 @@ namespace Sass {
     return is_left_interpolant() ||
             is_right_interpolant();
   }
-  
+
   void Binary_Expression::set_delayed(bool delayed)
   {
     right()->set_delayed(delayed);
@@ -485,24 +485,52 @@ namespace Sass {
   /////////////////////////////////////////////////////////////////////////
   /////////////////////////////////////////////////////////////////////////
 
-  Color::Color(ParserState pstate, double r, double g, double b, double a, const std::string disp)
-  : Value(pstate), r_(r), g_(g), b_(b), a_(a), disp_(disp),
+  Color::Color(ParserState pstate, double a, const std::string disp)
+  : Value(pstate),
+    disp_(disp), a_(a),
     hash_(0)
   { concrete_type(COLOR); }
 
   Color::Color(const Color* ptr)
-  : Value(ptr),
-    r_(ptr->r_),
-    g_(ptr->g_),
-    b_(ptr->b_),
+  : Value(ptr->pstate()),
+    // reset on copy
+    disp_(""),
     a_(ptr->a_),
-    disp_(ptr->disp_),
     hash_(ptr->hash_)
   { concrete_type(COLOR); }
 
   bool Color::operator== (const Expression& rhs) const
   {
-    if (auto r = Cast<Color>(&rhs)) {
+    if (auto r = Cast<Color_RGBA>(&rhs)) {
+      return *this == *r;
+    }
+    else if (auto r = Cast<Color_HSLA>(&rhs)) {
+      return *this == *r;
+    }
+    else if (auto r = Cast<Color>(&rhs)) {
+      return a_ == r->a();
+    }
+    return false;
+  }
+
+  /////////////////////////////////////////////////////////////////////////
+  /////////////////////////////////////////////////////////////////////////
+
+  Color_RGBA::Color_RGBA(ParserState pstate, double r, double g, double b, double a, const std::string disp)
+  : Color(pstate, a, disp),
+    r_(r), g_(g), b_(b)
+  { concrete_type(COLOR); }
+
+  Color_RGBA::Color_RGBA(const Color_RGBA* ptr)
+  : Color(ptr),
+    r_(ptr->r_),
+    g_(ptr->g_),
+    b_(ptr->b_)
+  { concrete_type(COLOR); }
+
+  bool Color_RGBA::operator== (const Expression& rhs) const
+  {
+    if (auto r = Cast<Color_RGBA>(&rhs)) {
       return r_ == r->r() &&
              g_ == r->g() &&
              b_ == r->b() &&
@@ -511,10 +539,11 @@ namespace Sass {
     return false;
   }
 
-  size_t Color::hash() const
+  size_t Color_RGBA::hash() const
   {
     if (hash_ == 0) {
-      hash_ = std::hash<double>()(a_);
+      hash_ = std::hash<std::string>()("RGBA");
+      hash_combine(hash_, std::hash<double>()(a_));
       hash_combine(hash_, std::hash<double>()(r_));
       hash_combine(hash_, std::hash<double>()(g_));
       hash_combine(hash_, std::hash<double>()(b_));
@@ -522,6 +551,128 @@ namespace Sass {
     return hash_;
   }
 
+  Color_HSLA_Ptr Color_RGBA::toHSLA(bool copy)
+  {
+
+    // Algorithm from http://en.wikipedia.org/wiki/wHSL_and_HSV#Conversion_from_RGB_to_HSL_or_HSV
+    double r = r_ / 255.0;
+    double g = g_ / 255.0;
+    double b = b_ / 255.0;
+
+    double max = std::max(r, std::max(g, b));
+    double min = std::min(r, std::min(g, b));
+    double delta = max - min;
+
+    double h = 0;
+    double s;
+    double l = (max + min) / 2.0;
+
+    if (NEAR_EQUAL(max, min)) {
+      h = s = 0; // achromatic
+    }
+    else {
+      if (l < 0.5) s = delta / (max + min);
+      else         s = delta / (2.0 - max - min);
+
+      if      (r == max) h = (g - b) / delta + (g < b ? 6 : 0);
+      else if (g == max) h = (b - r) / delta + 2;
+      else if (b == max) h = (r - g) / delta + 4;
+    }
+
+    // HSL hsl_struct;
+    h = h * 60;
+    s = s * 100;
+    l = l * 100;
+
+    return SASS_MEMORY_NEW(Color_HSLA,
+      pstate(), h, s, l, a(), ""
+    );
+  }
+
+  Color_RGBA_Ptr Color_RGBA::toRGBA(bool copy)
+  {
+    return copy ? SASS_MEMORY_COPY(this) : this;
+  }
+
+  /////////////////////////////////////////////////////////////////////////
+  /////////////////////////////////////////////////////////////////////////
+
+  Color_HSLA::Color_HSLA(ParserState pstate, double h, double s, double l, double a, const std::string disp)
+  : Color(pstate, a, disp),
+    h_(absmod(h, 360.0)),
+    s_(clip(s, 0.0, 100.0)),
+    l_(clip(l, 0.0, 100.0))
+    // hash_(0)
+  { concrete_type(COLOR); }
+
+  Color_HSLA::Color_HSLA(const Color_HSLA* ptr)
+  : Color(ptr),
+    h_(ptr->h_),
+    s_(ptr->s_),
+    l_(ptr->l_)
+    // hash_(ptr->hash_)
+  { concrete_type(COLOR); }
+
+  bool Color_HSLA::operator== (const Expression& rhs) const
+  {
+    if (auto r = Cast<Color_HSLA>(&rhs)) {
+      return h_ == r->h() &&
+             s_ == r->s() &&
+             l_ == r->l() &&
+             a_ == r->a();
+    }
+    return false;
+  }
+
+  size_t Color_HSLA::hash() const
+  {
+    if (hash_ == 0) {
+      hash_ = std::hash<std::string>()("HSLA");
+      hash_combine(hash_, std::hash<double>()(a_));
+      hash_combine(hash_, std::hash<double>()(h_));
+      hash_combine(hash_, std::hash<double>()(s_));
+      hash_combine(hash_, std::hash<double>()(l_));
+    }
+    return hash_;
+  }
+
+  // hue to RGB helper function
+  double h_to_rgb(double m1, double m2, double h)
+  {
+    h = absmod(h, 1.0);
+    if (h*6.0 < 1) return m1 + (m2 - m1)*h*6;
+    if (h*2.0 < 1) return m2;
+    if (h*3.0 < 2) return m1 + (m2 - m1) * (2.0/3.0 - h)*6;
+    return m1;
+  }
+
+  Color_RGBA_Ptr Color_HSLA::toRGBA(bool copy)
+  {
+
+    double h = absmod(h_ / 360.0, 1.0);
+    double s = clip(s_ / 100.0, 0.0, 1.0);
+    double l = clip(l_ / 100.0, 0.0, 1.0);
+
+    // Algorithm from the CSS3 spec: http://www.w3.org/TR/css3-color/#hsl-color.
+    double m2;
+    if (l <= 0.5) m2 = l*(s+1.0);
+    else m2 = (l+s)-(l*s);
+    double m1 = (l*2.0)-m2;
+    // round the results -- consider moving this into the Color constructor
+    double r = (h_to_rgb(m1, m2, h + 1.0/3.0) * 255.0);
+    double g = (h_to_rgb(m1, m2, h) * 255.0);
+    double b = (h_to_rgb(m1, m2, h - 1.0/3.0) * 255.0);
+
+    return SASS_MEMORY_NEW(Color_RGBA,
+      pstate(), r, g, b, a(), ""
+    );
+  }
+
+  Color_HSLA_Ptr Color_HSLA::toHSLA(bool copy)
+  {
+    return copy ? SASS_MEMORY_COPY(this) : this;
+  }
+
   /////////////////////////////////////////////////////////////////////////
   /////////////////////////////////////////////////////////////////////////
 
@@ -796,7 +947,8 @@ namespace Sass {
   IMPLEMENT_AST_OPERATORS(Function_Call);
   IMPLEMENT_AST_OPERATORS(Variable);
   IMPLEMENT_AST_OPERATORS(Number);
-  IMPLEMENT_AST_OPERATORS(Color);
+  IMPLEMENT_AST_OPERATORS(Color_RGBA);
+  IMPLEMENT_AST_OPERATORS(Color_HSLA);
   IMPLEMENT_AST_OPERATORS(Custom_Error);
   IMPLEMENT_AST_OPERATORS(Custom_Warning);
   IMPLEMENT_AST_OPERATORS(Boolean);
diff --git a/src/ast_values.hpp b/src/ast_values.hpp
index ee49962e5..0df859199 100644
--- a/src/ast_values.hpp
+++ b/src/ast_values.hpp
@@ -39,7 +39,6 @@ namespace Sass {
   class PreValue : public Expression {
   public:
     PreValue(ParserState pstate, bool d = false, bool e = false, bool i = false, Type ct = NONE);
-    PreValue(const PreValue* ptr);
     ATTACH_VIRTUAL_AST_OPERATIONS(PreValue);
     virtual ~PreValue() { }
   };
@@ -50,7 +49,6 @@ namespace Sass {
   class Value : public PreValue {
   public:
     Value(ParserState pstate, bool d = false, bool e = false, bool i = false, Type ct = NONE);
-    Value(const Value* ptr);
     ATTACH_VIRTUAL_AST_OPERATIONS(Value);
     virtual bool operator== (const Expression& rhs) const override = 0;
   };
@@ -237,24 +235,71 @@ namespace Sass {
   //////////
   // Colors.
   //////////
-  class Color final : public Value {
+  class Color : public Value {
+    ADD_CONSTREF(std::string, disp)
+    HASH_PROPERTY(double, a)
+  protected:
+    mutable size_t hash_;
+  public:
+    Color(ParserState pstate, double a = 1, const std::string disp = "");
+
+    std::string type() const override { return "color"; }
+    static std::string type_name() { return "color"; }
+
+    virtual size_t hash() const override = 0;
+
+    bool operator== (const Expression& rhs) const override;
+
+    virtual Color_RGBA_Ptr toRGBA(bool copy = false) = 0;
+    virtual Color_HSLA_Ptr toHSLA(bool copy = false) = 0;
+
+    ATTACH_VIRTUAL_AST_OPERATIONS(Color)
+  };
+
+  //////////
+  // Colors.
+  //////////
+  class Color_RGBA final : public Color {
     HASH_PROPERTY(double, r)
     HASH_PROPERTY(double, g)
     HASH_PROPERTY(double, b)
-    HASH_PROPERTY(double, a)
-    ADD_CONSTREF(std::string, disp)
-    mutable size_t hash_;
   public:
-    Color(ParserState pstate, double r, double g, double b, double a = 1, const std::string disp = "");
+    Color_RGBA(ParserState pstate, double r, double g, double b, double a = 1, const std::string disp = "");
+
+    std::string type() const override { return "color"; }
+    static std::string type_name() { return "color"; }
+
+    size_t hash() const override;
+    Color_RGBA_Ptr toRGBA(bool copy = false) override;
+    Color_HSLA_Ptr toHSLA(bool copy = false) override;
+
+    bool operator== (const Expression& rhs) const override;
+
+    ATTACH_AST_OPERATIONS(Color_RGBA)
+    ATTACH_CRTP_PERFORM_METHODS()
+  };
+
+
+  //////////
+  // Colors.
+  //////////
+  class Color_HSLA final : public Color {
+    HASH_PROPERTY(double, h)
+    HASH_PROPERTY(double, s)
+    HASH_PROPERTY(double, l)
+  public:
+    Color_HSLA(ParserState pstate, double h, double s, double l, double a = 1, const std::string disp = "");
 
     std::string type() const override { return "color"; }
     static std::string type_name() { return "color"; }
 
     size_t hash() const override;
+    Color_RGBA_Ptr toRGBA(bool copy = false) override;
+    Color_HSLA_Ptr toHSLA(bool copy = false) override;
 
     bool operator== (const Expression& rhs) const override;
 
-    ATTACH_AST_OPERATIONS(Color)
+    ATTACH_AST_OPERATIONS(Color_HSLA)
     ATTACH_CRTP_PERFORM_METHODS()
   };
 
@@ -312,7 +357,6 @@ namespace Sass {
   class String : public Value {
   public:
     String(ParserState pstate, bool delayed = false);
-    String(const String* ptr);
     static std::string type_name() { return "string"; }
     virtual ~String() = 0;
     virtual void rtrim() = 0;
diff --git a/src/c2ast.cpp b/src/c2ast.cpp
index c766fa184..3bcbe09d1 100644
--- a/src/c2ast.cpp
+++ b/src/c2ast.cpp
@@ -21,7 +21,7 @@ namespace Sass {
         e = SASS_MEMORY_NEW(Number, pstate, sass_number_get_value(v), sass_number_get_unit(v));
       } break;
       case SASS_COLOR: {
-        e = SASS_MEMORY_NEW(Color, pstate, sass_color_get_r(v), sass_color_get_g(v), sass_color_get_b(v), sass_color_get_a(v));
+        e = SASS_MEMORY_NEW(Color_RGBA, pstate, sass_color_get_r(v), sass_color_get_g(v), sass_color_get_b(v), sass_color_get_a(v));
       } break;
       case SASS_STRING: {
         if (sass_string_is_quoted(v))
diff --git a/src/color_maps.cpp b/src/color_maps.cpp
index 129e47c5a..7ad0c3987 100644
--- a/src/color_maps.cpp
+++ b/src/color_maps.cpp
@@ -159,155 +159,155 @@ namespace Sass {
 
   namespace Colors {
     const ParserState color_table("[COLOR TABLE]");
-    const Color aliceblue(color_table, 240, 248, 255, 1);
-    const Color antiquewhite(color_table, 250, 235, 215, 1);
-    const Color cyan(color_table, 0, 255, 255, 1);
-    const Color aqua(color_table, 0, 255, 255, 1);
-    const Color aquamarine(color_table, 127, 255, 212, 1);
-    const Color azure(color_table, 240, 255, 255, 1);
-    const Color beige(color_table, 245, 245, 220, 1);
-    const Color bisque(color_table, 255, 228, 196, 1);
-    const Color black(color_table, 0, 0, 0, 1);
-    const Color blanchedalmond(color_table, 255, 235, 205, 1);
-    const Color blue(color_table, 0, 0, 255, 1);
-    const Color blueviolet(color_table, 138, 43, 226, 1);
-    const Color brown(color_table, 165, 42, 42, 1);
-    const Color burlywood(color_table, 222, 184, 135, 1);
-    const Color cadetblue(color_table, 95, 158, 160, 1);
-    const Color chartreuse(color_table, 127, 255, 0, 1);
-    const Color chocolate(color_table, 210, 105, 30, 1);
-    const Color coral(color_table, 255, 127, 80, 1);
-    const Color cornflowerblue(color_table, 100, 149, 237, 1);
-    const Color cornsilk(color_table, 255, 248, 220, 1);
-    const Color crimson(color_table, 220, 20, 60, 1);
-    const Color darkblue(color_table, 0, 0, 139, 1);
-    const Color darkcyan(color_table, 0, 139, 139, 1);
-    const Color darkgoldenrod(color_table, 184, 134, 11, 1);
-    const Color darkgray(color_table, 169, 169, 169, 1);
-    const Color darkgrey(color_table, 169, 169, 169, 1);
-    const Color darkgreen(color_table, 0, 100, 0, 1);
-    const Color darkkhaki(color_table, 189, 183, 107, 1);
-    const Color darkmagenta(color_table, 139, 0, 139, 1);
-    const Color darkolivegreen(color_table, 85, 107, 47, 1);
-    const Color darkorange(color_table, 255, 140, 0, 1);
-    const Color darkorchid(color_table, 153, 50, 204, 1);
-    const Color darkred(color_table, 139, 0, 0, 1);
-    const Color darksalmon(color_table, 233, 150, 122, 1);
-    const Color darkseagreen(color_table, 143, 188, 143, 1);
-    const Color darkslateblue(color_table, 72, 61, 139, 1);
-    const Color darkslategray(color_table, 47, 79, 79, 1);
-    const Color darkslategrey(color_table, 47, 79, 79, 1);
-    const Color darkturquoise(color_table, 0, 206, 209, 1);
-    const Color darkviolet(color_table, 148, 0, 211, 1);
-    const Color deeppink(color_table, 255, 20, 147, 1);
-    const Color deepskyblue(color_table, 0, 191, 255, 1);
-    const Color dimgray(color_table, 105, 105, 105, 1);
-    const Color dimgrey(color_table, 105, 105, 105, 1);
-    const Color dodgerblue(color_table, 30, 144, 255, 1);
-    const Color firebrick(color_table, 178, 34, 34, 1);
-    const Color floralwhite(color_table, 255, 250, 240, 1);
-    const Color forestgreen(color_table, 34, 139, 34, 1);
-    const Color magenta(color_table, 255, 0, 255, 1);
-    const Color fuchsia(color_table, 255, 0, 255, 1);
-    const Color gainsboro(color_table, 220, 220, 220, 1);
-    const Color ghostwhite(color_table, 248, 248, 255, 1);
-    const Color gold(color_table, 255, 215, 0, 1);
-    const Color goldenrod(color_table, 218, 165, 32, 1);
-    const Color gray(color_table, 128, 128, 128, 1);
-    const Color grey(color_table, 128, 128, 128, 1);
-    const Color green(color_table, 0, 128, 0, 1);
-    const Color greenyellow(color_table, 173, 255, 47, 1);
-    const Color honeydew(color_table, 240, 255, 240, 1);
-    const Color hotpink(color_table, 255, 105, 180, 1);
-    const Color indianred(color_table, 205, 92, 92, 1);
-    const Color indigo(color_table, 75, 0, 130, 1);
-    const Color ivory(color_table, 255, 255, 240, 1);
-    const Color khaki(color_table, 240, 230, 140, 1);
-    const Color lavender(color_table, 230, 230, 250, 1);
-    const Color lavenderblush(color_table, 255, 240, 245, 1);
-    const Color lawngreen(color_table, 124, 252, 0, 1);
-    const Color lemonchiffon(color_table, 255, 250, 205, 1);
-    const Color lightblue(color_table, 173, 216, 230, 1);
-    const Color lightcoral(color_table, 240, 128, 128, 1);
-    const Color lightcyan(color_table, 224, 255, 255, 1);
-    const Color lightgoldenrodyellow(color_table, 250, 250, 210, 1);
-    const Color lightgray(color_table, 211, 211, 211, 1);
-    const Color lightgrey(color_table, 211, 211, 211, 1);
-    const Color lightgreen(color_table, 144, 238, 144, 1);
-    const Color lightpink(color_table, 255, 182, 193, 1);
-    const Color lightsalmon(color_table, 255, 160, 122, 1);
-    const Color lightseagreen(color_table, 32, 178, 170, 1);
-    const Color lightskyblue(color_table, 135, 206, 250, 1);
-    const Color lightslategray(color_table, 119, 136, 153, 1);
-    const Color lightslategrey(color_table, 119, 136, 153, 1);
-    const Color lightsteelblue(color_table, 176, 196, 222, 1);
-    const Color lightyellow(color_table, 255, 255, 224, 1);
-    const Color lime(color_table, 0, 255, 0, 1);
-    const Color limegreen(color_table, 50, 205, 50, 1);
-    const Color linen(color_table, 250, 240, 230, 1);
-    const Color maroon(color_table, 128, 0, 0, 1);
-    const Color mediumaquamarine(color_table, 102, 205, 170, 1);
-    const Color mediumblue(color_table, 0, 0, 205, 1);
-    const Color mediumorchid(color_table, 186, 85, 211, 1);
-    const Color mediumpurple(color_table, 147, 112, 219, 1);
-    const Color mediumseagreen(color_table, 60, 179, 113, 1);
-    const Color mediumslateblue(color_table, 123, 104, 238, 1);
-    const Color mediumspringgreen(color_table, 0, 250, 154, 1);
-    const Color mediumturquoise(color_table, 72, 209, 204, 1);
-    const Color mediumvioletred(color_table, 199, 21, 133, 1);
-    const Color midnightblue(color_table, 25, 25, 112, 1);
-    const Color mintcream(color_table, 245, 255, 250, 1);
-    const Color mistyrose(color_table, 255, 228, 225, 1);
-    const Color moccasin(color_table, 255, 228, 181, 1);
-    const Color navajowhite(color_table, 255, 222, 173, 1);
-    const Color navy(color_table, 0, 0, 128, 1);
-    const Color oldlace(color_table, 253, 245, 230, 1);
-    const Color olive(color_table, 128, 128, 0, 1);
-    const Color olivedrab(color_table, 107, 142, 35, 1);
-    const Color orange(color_table, 255, 165, 0, 1);
-    const Color orangered(color_table, 255, 69, 0, 1);
-    const Color orchid(color_table, 218, 112, 214, 1);
-    const Color palegoldenrod(color_table, 238, 232, 170, 1);
-    const Color palegreen(color_table, 152, 251, 152, 1);
-    const Color paleturquoise(color_table, 175, 238, 238, 1);
-    const Color palevioletred(color_table, 219, 112, 147, 1);
-    const Color papayawhip(color_table, 255, 239, 213, 1);
-    const Color peachpuff(color_table, 255, 218, 185, 1);
-    const Color peru(color_table, 205, 133, 63, 1);
-    const Color pink(color_table, 255, 192, 203, 1);
-    const Color plum(color_table, 221, 160, 221, 1);
-    const Color powderblue(color_table, 176, 224, 230, 1);
-    const Color purple(color_table, 128, 0, 128, 1);
-    const Color red(color_table, 255, 0, 0, 1);
-    const Color rosybrown(color_table, 188, 143, 143, 1);
-    const Color royalblue(color_table, 65, 105, 225, 1);
-    const Color saddlebrown(color_table, 139, 69, 19, 1);
-    const Color salmon(color_table, 250, 128, 114, 1);
-    const Color sandybrown(color_table, 244, 164, 96, 1);
-    const Color seagreen(color_table, 46, 139, 87, 1);
-    const Color seashell(color_table, 255, 245, 238, 1);
-    const Color sienna(color_table, 160, 82, 45, 1);
-    const Color silver(color_table, 192, 192, 192, 1);
-    const Color skyblue(color_table, 135, 206, 235, 1);
-    const Color slateblue(color_table, 106, 90, 205, 1);
-    const Color slategray(color_table, 112, 128, 144, 1);
-    const Color slategrey(color_table, 112, 128, 144, 1);
-    const Color snow(color_table, 255, 250, 250, 1);
-    const Color springgreen(color_table, 0, 255, 127, 1);
-    const Color steelblue(color_table, 70, 130, 180, 1);
-    const Color tan(color_table, 210, 180, 140, 1);
-    const Color teal(color_table, 0, 128, 128, 1);
-    const Color thistle(color_table, 216, 191, 216, 1);
-    const Color tomato(color_table, 255, 99, 71, 1);
-    const Color turquoise(color_table, 64, 224, 208, 1);
-    const Color violet(color_table, 238, 130, 238, 1);
-    const Color wheat(color_table, 245, 222, 179, 1);
-    const Color white(color_table, 255, 255, 255, 1);
-    const Color whitesmoke(color_table, 245, 245, 245, 1);
-    const Color yellow(color_table, 255, 255, 0, 1);
-    const Color yellowgreen(color_table, 154, 205, 50, 1);
-    const Color rebeccapurple(color_table, 102, 51, 153, 1);
-    const Color transparent(color_table, 0, 0, 0, 0);
+    const Color_RGBA aliceblue(color_table, 240, 248, 255, 1);
+    const Color_RGBA antiquewhite(color_table, 250, 235, 215, 1);
+    const Color_RGBA cyan(color_table, 0, 255, 255, 1);
+    const Color_RGBA aqua(color_table, 0, 255, 255, 1);
+    const Color_RGBA aquamarine(color_table, 127, 255, 212, 1);
+    const Color_RGBA azure(color_table, 240, 255, 255, 1);
+    const Color_RGBA beige(color_table, 245, 245, 220, 1);
+    const Color_RGBA bisque(color_table, 255, 228, 196, 1);
+    const Color_RGBA black(color_table, 0, 0, 0, 1);
+    const Color_RGBA blanchedalmond(color_table, 255, 235, 205, 1);
+    const Color_RGBA blue(color_table, 0, 0, 255, 1);
+    const Color_RGBA blueviolet(color_table, 138, 43, 226, 1);
+    const Color_RGBA brown(color_table, 165, 42, 42, 1);
+    const Color_RGBA burlywood(color_table, 222, 184, 135, 1);
+    const Color_RGBA cadetblue(color_table, 95, 158, 160, 1);
+    const Color_RGBA chartreuse(color_table, 127, 255, 0, 1);
+    const Color_RGBA chocolate(color_table, 210, 105, 30, 1);
+    const Color_RGBA coral(color_table, 255, 127, 80, 1);
+    const Color_RGBA cornflowerblue(color_table, 100, 149, 237, 1);
+    const Color_RGBA cornsilk(color_table, 255, 248, 220, 1);
+    const Color_RGBA crimson(color_table, 220, 20, 60, 1);
+    const Color_RGBA darkblue(color_table, 0, 0, 139, 1);
+    const Color_RGBA darkcyan(color_table, 0, 139, 139, 1);
+    const Color_RGBA darkgoldenrod(color_table, 184, 134, 11, 1);
+    const Color_RGBA darkgray(color_table, 169, 169, 169, 1);
+    const Color_RGBA darkgrey(color_table, 169, 169, 169, 1);
+    const Color_RGBA darkgreen(color_table, 0, 100, 0, 1);
+    const Color_RGBA darkkhaki(color_table, 189, 183, 107, 1);
+    const Color_RGBA darkmagenta(color_table, 139, 0, 139, 1);
+    const Color_RGBA darkolivegreen(color_table, 85, 107, 47, 1);
+    const Color_RGBA darkorange(color_table, 255, 140, 0, 1);
+    const Color_RGBA darkorchid(color_table, 153, 50, 204, 1);
+    const Color_RGBA darkred(color_table, 139, 0, 0, 1);
+    const Color_RGBA darksalmon(color_table, 233, 150, 122, 1);
+    const Color_RGBA darkseagreen(color_table, 143, 188, 143, 1);
+    const Color_RGBA darkslateblue(color_table, 72, 61, 139, 1);
+    const Color_RGBA darkslategray(color_table, 47, 79, 79, 1);
+    const Color_RGBA darkslategrey(color_table, 47, 79, 79, 1);
+    const Color_RGBA darkturquoise(color_table, 0, 206, 209, 1);
+    const Color_RGBA darkviolet(color_table, 148, 0, 211, 1);
+    const Color_RGBA deeppink(color_table, 255, 20, 147, 1);
+    const Color_RGBA deepskyblue(color_table, 0, 191, 255, 1);
+    const Color_RGBA dimgray(color_table, 105, 105, 105, 1);
+    const Color_RGBA dimgrey(color_table, 105, 105, 105, 1);
+    const Color_RGBA dodgerblue(color_table, 30, 144, 255, 1);
+    const Color_RGBA firebrick(color_table, 178, 34, 34, 1);
+    const Color_RGBA floralwhite(color_table, 255, 250, 240, 1);
+    const Color_RGBA forestgreen(color_table, 34, 139, 34, 1);
+    const Color_RGBA magenta(color_table, 255, 0, 255, 1);
+    const Color_RGBA fuchsia(color_table, 255, 0, 255, 1);
+    const Color_RGBA gainsboro(color_table, 220, 220, 220, 1);
+    const Color_RGBA ghostwhite(color_table, 248, 248, 255, 1);
+    const Color_RGBA gold(color_table, 255, 215, 0, 1);
+    const Color_RGBA goldenrod(color_table, 218, 165, 32, 1);
+    const Color_RGBA gray(color_table, 128, 128, 128, 1);
+    const Color_RGBA grey(color_table, 128, 128, 128, 1);
+    const Color_RGBA green(color_table, 0, 128, 0, 1);
+    const Color_RGBA greenyellow(color_table, 173, 255, 47, 1);
+    const Color_RGBA honeydew(color_table, 240, 255, 240, 1);
+    const Color_RGBA hotpink(color_table, 255, 105, 180, 1);
+    const Color_RGBA indianred(color_table, 205, 92, 92, 1);
+    const Color_RGBA indigo(color_table, 75, 0, 130, 1);
+    const Color_RGBA ivory(color_table, 255, 255, 240, 1);
+    const Color_RGBA khaki(color_table, 240, 230, 140, 1);
+    const Color_RGBA lavender(color_table, 230, 230, 250, 1);
+    const Color_RGBA lavenderblush(color_table, 255, 240, 245, 1);
+    const Color_RGBA lawngreen(color_table, 124, 252, 0, 1);
+    const Color_RGBA lemonchiffon(color_table, 255, 250, 205, 1);
+    const Color_RGBA lightblue(color_table, 173, 216, 230, 1);
+    const Color_RGBA lightcoral(color_table, 240, 128, 128, 1);
+    const Color_RGBA lightcyan(color_table, 224, 255, 255, 1);
+    const Color_RGBA lightgoldenrodyellow(color_table, 250, 250, 210, 1);
+    const Color_RGBA lightgray(color_table, 211, 211, 211, 1);
+    const Color_RGBA lightgrey(color_table, 211, 211, 211, 1);
+    const Color_RGBA lightgreen(color_table, 144, 238, 144, 1);
+    const Color_RGBA lightpink(color_table, 255, 182, 193, 1);
+    const Color_RGBA lightsalmon(color_table, 255, 160, 122, 1);
+    const Color_RGBA lightseagreen(color_table, 32, 178, 170, 1);
+    const Color_RGBA lightskyblue(color_table, 135, 206, 250, 1);
+    const Color_RGBA lightslategray(color_table, 119, 136, 153, 1);
+    const Color_RGBA lightslategrey(color_table, 119, 136, 153, 1);
+    const Color_RGBA lightsteelblue(color_table, 176, 196, 222, 1);
+    const Color_RGBA lightyellow(color_table, 255, 255, 224, 1);
+    const Color_RGBA lime(color_table, 0, 255, 0, 1);
+    const Color_RGBA limegreen(color_table, 50, 205, 50, 1);
+    const Color_RGBA linen(color_table, 250, 240, 230, 1);
+    const Color_RGBA maroon(color_table, 128, 0, 0, 1);
+    const Color_RGBA mediumaquamarine(color_table, 102, 205, 170, 1);
+    const Color_RGBA mediumblue(color_table, 0, 0, 205, 1);
+    const Color_RGBA mediumorchid(color_table, 186, 85, 211, 1);
+    const Color_RGBA mediumpurple(color_table, 147, 112, 219, 1);
+    const Color_RGBA mediumseagreen(color_table, 60, 179, 113, 1);
+    const Color_RGBA mediumslateblue(color_table, 123, 104, 238, 1);
+    const Color_RGBA mediumspringgreen(color_table, 0, 250, 154, 1);
+    const Color_RGBA mediumturquoise(color_table, 72, 209, 204, 1);
+    const Color_RGBA mediumvioletred(color_table, 199, 21, 133, 1);
+    const Color_RGBA midnightblue(color_table, 25, 25, 112, 1);
+    const Color_RGBA mintcream(color_table, 245, 255, 250, 1);
+    const Color_RGBA mistyrose(color_table, 255, 228, 225, 1);
+    const Color_RGBA moccasin(color_table, 255, 228, 181, 1);
+    const Color_RGBA navajowhite(color_table, 255, 222, 173, 1);
+    const Color_RGBA navy(color_table, 0, 0, 128, 1);
+    const Color_RGBA oldlace(color_table, 253, 245, 230, 1);
+    const Color_RGBA olive(color_table, 128, 128, 0, 1);
+    const Color_RGBA olivedrab(color_table, 107, 142, 35, 1);
+    const Color_RGBA orange(color_table, 255, 165, 0, 1);
+    const Color_RGBA orangered(color_table, 255, 69, 0, 1);
+    const Color_RGBA orchid(color_table, 218, 112, 214, 1);
+    const Color_RGBA palegoldenrod(color_table, 238, 232, 170, 1);
+    const Color_RGBA palegreen(color_table, 152, 251, 152, 1);
+    const Color_RGBA paleturquoise(color_table, 175, 238, 238, 1);
+    const Color_RGBA palevioletred(color_table, 219, 112, 147, 1);
+    const Color_RGBA papayawhip(color_table, 255, 239, 213, 1);
+    const Color_RGBA peachpuff(color_table, 255, 218, 185, 1);
+    const Color_RGBA peru(color_table, 205, 133, 63, 1);
+    const Color_RGBA pink(color_table, 255, 192, 203, 1);
+    const Color_RGBA plum(color_table, 221, 160, 221, 1);
+    const Color_RGBA powderblue(color_table, 176, 224, 230, 1);
+    const Color_RGBA purple(color_table, 128, 0, 128, 1);
+    const Color_RGBA red(color_table, 255, 0, 0, 1);
+    const Color_RGBA rosybrown(color_table, 188, 143, 143, 1);
+    const Color_RGBA royalblue(color_table, 65, 105, 225, 1);
+    const Color_RGBA saddlebrown(color_table, 139, 69, 19, 1);
+    const Color_RGBA salmon(color_table, 250, 128, 114, 1);
+    const Color_RGBA sandybrown(color_table, 244, 164, 96, 1);
+    const Color_RGBA seagreen(color_table, 46, 139, 87, 1);
+    const Color_RGBA seashell(color_table, 255, 245, 238, 1);
+    const Color_RGBA sienna(color_table, 160, 82, 45, 1);
+    const Color_RGBA silver(color_table, 192, 192, 192, 1);
+    const Color_RGBA skyblue(color_table, 135, 206, 235, 1);
+    const Color_RGBA slateblue(color_table, 106, 90, 205, 1);
+    const Color_RGBA slategray(color_table, 112, 128, 144, 1);
+    const Color_RGBA slategrey(color_table, 112, 128, 144, 1);
+    const Color_RGBA snow(color_table, 255, 250, 250, 1);
+    const Color_RGBA springgreen(color_table, 0, 255, 127, 1);
+    const Color_RGBA steelblue(color_table, 70, 130, 180, 1);
+    const Color_RGBA tan(color_table, 210, 180, 140, 1);
+    const Color_RGBA teal(color_table, 0, 128, 128, 1);
+    const Color_RGBA thistle(color_table, 216, 191, 216, 1);
+    const Color_RGBA tomato(color_table, 255, 99, 71, 1);
+    const Color_RGBA turquoise(color_table, 64, 224, 208, 1);
+    const Color_RGBA violet(color_table, 238, 130, 238, 1);
+    const Color_RGBA wheat(color_table, 245, 222, 179, 1);
+    const Color_RGBA white(color_table, 255, 255, 255, 1);
+    const Color_RGBA whitesmoke(color_table, 245, 245, 245, 1);
+    const Color_RGBA yellow(color_table, 255, 255, 0, 1);
+    const Color_RGBA yellowgreen(color_table, 154, 205, 50, 1);
+    const Color_RGBA rebeccapurple(color_table, 102, 51, 153, 1);
+    const Color_RGBA transparent(color_table, 0, 0, 0, 0);
   }
 
   const std::map<const int, const char*> colors_to_names {
@@ -452,7 +452,7 @@ namespace Sass {
     { 102 * 0x10000 +  51 * 0x100 + 153, ColorNames::rebeccapurple }
   };
 
-  const std::map<const char*, Color_Ptr_Const, map_cmp_str> names_to_colors
+  const std::map<const char*, Color_RGBA_Ptr_Const, map_cmp_str> names_to_colors
   {
     { ColorNames::aliceblue, &Colors::aliceblue },
     { ColorNames::antiquewhite, &Colors::antiquewhite },
@@ -605,12 +605,12 @@ namespace Sass {
     { ColorNames::transparent, &Colors::transparent }
   };
 
-  Color_Ptr_Const name_to_color(const char* key)
+  Color_RGBA_Ptr_Const name_to_color(const char* key)
   {
     return name_to_color(std::string(key));
   }
 
-  Color_Ptr_Const name_to_color(const std::string& key)
+  Color_RGBA_Ptr_Const name_to_color(const std::string& key)
   {
     // case insensitive lookup.  See #2462
     std::string lower{key};
@@ -637,7 +637,7 @@ namespace Sass {
     return color_to_name((int)key);
   }
 
-  const char* color_to_name(const Color& c)
+  const char* color_to_name(const Color_RGBA& c)
   {
     double key = c.r() * 0x10000
                + c.g() * 0x100
diff --git a/src/color_maps.hpp b/src/color_maps.hpp
index d4fd41607..1e1978f1e 100644
--- a/src/color_maps.hpp
+++ b/src/color_maps.hpp
@@ -169,161 +169,161 @@ namespace Sass {
   }
 
   namespace Colors {
-    extern const Color aliceblue;
-    extern const Color antiquewhite;
-    extern const Color cyan;
-    extern const Color aqua;
-    extern const Color aquamarine;
-    extern const Color azure;
-    extern const Color beige;
-    extern const Color bisque;
-    extern const Color black;
-    extern const Color blanchedalmond;
-    extern const Color blue;
-    extern const Color blueviolet;
-    extern const Color brown;
-    extern const Color burlywood;
-    extern const Color cadetblue;
-    extern const Color chartreuse;
-    extern const Color chocolate;
-    extern const Color coral;
-    extern const Color cornflowerblue;
-    extern const Color cornsilk;
-    extern const Color crimson;
-    extern const Color darkblue;
-    extern const Color darkcyan;
-    extern const Color darkgoldenrod;
-    extern const Color darkgray;
-    extern const Color darkgrey;
-    extern const Color darkgreen;
-    extern const Color darkkhaki;
-    extern const Color darkmagenta;
-    extern const Color darkolivegreen;
-    extern const Color darkorange;
-    extern const Color darkorchid;
-    extern const Color darkred;
-    extern const Color darksalmon;
-    extern const Color darkseagreen;
-    extern const Color darkslateblue;
-    extern const Color darkslategray;
-    extern const Color darkslategrey;
-    extern const Color darkturquoise;
-    extern const Color darkviolet;
-    extern const Color deeppink;
-    extern const Color deepskyblue;
-    extern const Color dimgray;
-    extern const Color dimgrey;
-    extern const Color dodgerblue;
-    extern const Color firebrick;
-    extern const Color floralwhite;
-    extern const Color forestgreen;
-    extern const Color magenta;
-    extern const Color fuchsia;
-    extern const Color gainsboro;
-    extern const Color ghostwhite;
-    extern const Color gold;
-    extern const Color goldenrod;
-    extern const Color gray;
-    extern const Color grey;
-    extern const Color green;
-    extern const Color greenyellow;
-    extern const Color honeydew;
-    extern const Color hotpink;
-    extern const Color indianred;
-    extern const Color indigo;
-    extern const Color ivory;
-    extern const Color khaki;
-    extern const Color lavender;
-    extern const Color lavenderblush;
-    extern const Color lawngreen;
-    extern const Color lemonchiffon;
-    extern const Color lightblue;
-    extern const Color lightcoral;
-    extern const Color lightcyan;
-    extern const Color lightgoldenrodyellow;
-    extern const Color lightgray;
-    extern const Color lightgrey;
-    extern const Color lightgreen;
-    extern const Color lightpink;
-    extern const Color lightsalmon;
-    extern const Color lightseagreen;
-    extern const Color lightskyblue;
-    extern const Color lightslategray;
-    extern const Color lightslategrey;
-    extern const Color lightsteelblue;
-    extern const Color lightyellow;
-    extern const Color lime;
-    extern const Color limegreen;
-    extern const Color linen;
-    extern const Color maroon;
-    extern const Color mediumaquamarine;
-    extern const Color mediumblue;
-    extern const Color mediumorchid;
-    extern const Color mediumpurple;
-    extern const Color mediumseagreen;
-    extern const Color mediumslateblue;
-    extern const Color mediumspringgreen;
-    extern const Color mediumturquoise;
-    extern const Color mediumvioletred;
-    extern const Color midnightblue;
-    extern const Color mintcream;
-    extern const Color mistyrose;
-    extern const Color moccasin;
-    extern const Color navajowhite;
-    extern const Color navy;
-    extern const Color oldlace;
-    extern const Color olive;
-    extern const Color olivedrab;
-    extern const Color orange;
-    extern const Color orangered;
-    extern const Color orchid;
-    extern const Color palegoldenrod;
-    extern const Color palegreen;
-    extern const Color paleturquoise;
-    extern const Color palevioletred;
-    extern const Color papayawhip;
-    extern const Color peachpuff;
-    extern const Color peru;
-    extern const Color pink;
-    extern const Color plum;
-    extern const Color powderblue;
-    extern const Color purple;
-    extern const Color red;
-    extern const Color rosybrown;
-    extern const Color royalblue;
-    extern const Color saddlebrown;
-    extern const Color salmon;
-    extern const Color sandybrown;
-    extern const Color seagreen;
-    extern const Color seashell;
-    extern const Color sienna;
-    extern const Color silver;
-    extern const Color skyblue;
-    extern const Color slateblue;
-    extern const Color slategray;
-    extern const Color slategrey;
-    extern const Color snow;
-    extern const Color springgreen;
-    extern const Color steelblue;
-    extern const Color tan;
-    extern const Color teal;
-    extern const Color thistle;
-    extern const Color tomato;
-    extern const Color turquoise;
-    extern const Color violet;
-    extern const Color wheat;
-    extern const Color white;
-    extern const Color whitesmoke;
-    extern const Color yellow;
-    extern const Color yellowgreen;
-    extern const Color rebeccapurple;
-    extern const Color transparent;
+    extern const Color_RGBA aliceblue;
+    extern const Color_RGBA antiquewhite;
+    extern const Color_RGBA cyan;
+    extern const Color_RGBA aqua;
+    extern const Color_RGBA aquamarine;
+    extern const Color_RGBA azure;
+    extern const Color_RGBA beige;
+    extern const Color_RGBA bisque;
+    extern const Color_RGBA black;
+    extern const Color_RGBA blanchedalmond;
+    extern const Color_RGBA blue;
+    extern const Color_RGBA blueviolet;
+    extern const Color_RGBA brown;
+    extern const Color_RGBA burlywood;
+    extern const Color_RGBA cadetblue;
+    extern const Color_RGBA chartreuse;
+    extern const Color_RGBA chocolate;
+    extern const Color_RGBA coral;
+    extern const Color_RGBA cornflowerblue;
+    extern const Color_RGBA cornsilk;
+    extern const Color_RGBA crimson;
+    extern const Color_RGBA darkblue;
+    extern const Color_RGBA darkcyan;
+    extern const Color_RGBA darkgoldenrod;
+    extern const Color_RGBA darkgray;
+    extern const Color_RGBA darkgrey;
+    extern const Color_RGBA darkgreen;
+    extern const Color_RGBA darkkhaki;
+    extern const Color_RGBA darkmagenta;
+    extern const Color_RGBA darkolivegreen;
+    extern const Color_RGBA darkorange;
+    extern const Color_RGBA darkorchid;
+    extern const Color_RGBA darkred;
+    extern const Color_RGBA darksalmon;
+    extern const Color_RGBA darkseagreen;
+    extern const Color_RGBA darkslateblue;
+    extern const Color_RGBA darkslategray;
+    extern const Color_RGBA darkslategrey;
+    extern const Color_RGBA darkturquoise;
+    extern const Color_RGBA darkviolet;
+    extern const Color_RGBA deeppink;
+    extern const Color_RGBA deepskyblue;
+    extern const Color_RGBA dimgray;
+    extern const Color_RGBA dimgrey;
+    extern const Color_RGBA dodgerblue;
+    extern const Color_RGBA firebrick;
+    extern const Color_RGBA floralwhite;
+    extern const Color_RGBA forestgreen;
+    extern const Color_RGBA magenta;
+    extern const Color_RGBA fuchsia;
+    extern const Color_RGBA gainsboro;
+    extern const Color_RGBA ghostwhite;
+    extern const Color_RGBA gold;
+    extern const Color_RGBA goldenrod;
+    extern const Color_RGBA gray;
+    extern const Color_RGBA grey;
+    extern const Color_RGBA green;
+    extern const Color_RGBA greenyellow;
+    extern const Color_RGBA honeydew;
+    extern const Color_RGBA hotpink;
+    extern const Color_RGBA indianred;
+    extern const Color_RGBA indigo;
+    extern const Color_RGBA ivory;
+    extern const Color_RGBA khaki;
+    extern const Color_RGBA lavender;
+    extern const Color_RGBA lavenderblush;
+    extern const Color_RGBA lawngreen;
+    extern const Color_RGBA lemonchiffon;
+    extern const Color_RGBA lightblue;
+    extern const Color_RGBA lightcoral;
+    extern const Color_RGBA lightcyan;
+    extern const Color_RGBA lightgoldenrodyellow;
+    extern const Color_RGBA lightgray;
+    extern const Color_RGBA lightgrey;
+    extern const Color_RGBA lightgreen;
+    extern const Color_RGBA lightpink;
+    extern const Color_RGBA lightsalmon;
+    extern const Color_RGBA lightseagreen;
+    extern const Color_RGBA lightskyblue;
+    extern const Color_RGBA lightslategray;
+    extern const Color_RGBA lightslategrey;
+    extern const Color_RGBA lightsteelblue;
+    extern const Color_RGBA lightyellow;
+    extern const Color_RGBA lime;
+    extern const Color_RGBA limegreen;
+    extern const Color_RGBA linen;
+    extern const Color_RGBA maroon;
+    extern const Color_RGBA mediumaquamarine;
+    extern const Color_RGBA mediumblue;
+    extern const Color_RGBA mediumorchid;
+    extern const Color_RGBA mediumpurple;
+    extern const Color_RGBA mediumseagreen;
+    extern const Color_RGBA mediumslateblue;
+    extern const Color_RGBA mediumspringgreen;
+    extern const Color_RGBA mediumturquoise;
+    extern const Color_RGBA mediumvioletred;
+    extern const Color_RGBA midnightblue;
+    extern const Color_RGBA mintcream;
+    extern const Color_RGBA mistyrose;
+    extern const Color_RGBA moccasin;
+    extern const Color_RGBA navajowhite;
+    extern const Color_RGBA navy;
+    extern const Color_RGBA oldlace;
+    extern const Color_RGBA olive;
+    extern const Color_RGBA olivedrab;
+    extern const Color_RGBA orange;
+    extern const Color_RGBA orangered;
+    extern const Color_RGBA orchid;
+    extern const Color_RGBA palegoldenrod;
+    extern const Color_RGBA palegreen;
+    extern const Color_RGBA paleturquoise;
+    extern const Color_RGBA palevioletred;
+    extern const Color_RGBA papayawhip;
+    extern const Color_RGBA peachpuff;
+    extern const Color_RGBA peru;
+    extern const Color_RGBA pink;
+    extern const Color_RGBA plum;
+    extern const Color_RGBA powderblue;
+    extern const Color_RGBA purple;
+    extern const Color_RGBA red;
+    extern const Color_RGBA rosybrown;
+    extern const Color_RGBA royalblue;
+    extern const Color_RGBA saddlebrown;
+    extern const Color_RGBA salmon;
+    extern const Color_RGBA sandybrown;
+    extern const Color_RGBA seagreen;
+    extern const Color_RGBA seashell;
+    extern const Color_RGBA sienna;
+    extern const Color_RGBA silver;
+    extern const Color_RGBA skyblue;
+    extern const Color_RGBA slateblue;
+    extern const Color_RGBA slategray;
+    extern const Color_RGBA slategrey;
+    extern const Color_RGBA snow;
+    extern const Color_RGBA springgreen;
+    extern const Color_RGBA steelblue;
+    extern const Color_RGBA tan;
+    extern const Color_RGBA teal;
+    extern const Color_RGBA thistle;
+    extern const Color_RGBA tomato;
+    extern const Color_RGBA turquoise;
+    extern const Color_RGBA violet;
+    extern const Color_RGBA wheat;
+    extern const Color_RGBA white;
+    extern const Color_RGBA whitesmoke;
+    extern const Color_RGBA yellow;
+    extern const Color_RGBA yellowgreen;
+    extern const Color_RGBA rebeccapurple;
+    extern const Color_RGBA transparent;
   }
 
-  Color_Ptr_Const name_to_color(const char*);
-  Color_Ptr_Const name_to_color(const std::string&);
+  Color_RGBA_Ptr_Const name_to_color(const char*);
+  Color_RGBA_Ptr_Const name_to_color(const std::string&);
   const char* color_to_name(const int);
-  const char* color_to_name(const Color&);
+  const char* color_to_name(const Color_RGBA&);
   const char* color_to_name(const double);
 
 }
diff --git a/src/debugger.hpp b/src/debugger.hpp
index dfad6817a..91d459523 100644
--- a/src/debugger.hpp
+++ b/src/debugger.hpp
@@ -612,14 +612,22 @@ inline void debug_ast(AST_Node_Ptr node, std::string ind, Env* env)
     std::cerr << " (" << pstate_source_position(node) << ")";
     std::cerr << " [interpolant: " << expression->is_interpolant() << "] ";
     std::cerr << " [" << expression->value() << "]" << std::endl;
-  } else if (Cast<Color>(node)) {
-    Color_Ptr expression = Cast<Color>(node);
+  } else if (Cast<Color_RGBA>(node)) {
+    Color_RGBA_Ptr expression = Cast<Color_RGBA>(node);
     std::cerr << ind << "Color " << expression;
     std::cerr << " (" << pstate_source_position(node) << ")";
     std::cerr << " [name: " << expression->disp() << "] ";
     std::cerr << " [delayed: " << expression->is_delayed() << "] ";
     std::cerr << " [interpolant: " << expression->is_interpolant() << "] ";
-    std::cerr << " [" << expression->r() << ":"  << expression->g() << ":" << expression->b() << "@" << expression->a() << "]" << std::endl;
+    std::cerr << " rgba[" << expression->r() << ":"  << expression->g() << ":" << expression->b() << "@" << expression->a() << "]" << std::endl;
+  } else if (Cast<Color_HSLA>(node)) {
+    Color_HSLA_Ptr expression = Cast<Color_HSLA>(node);
+    std::cerr << ind << "Color " << expression;
+    std::cerr << " (" << pstate_source_position(node) << ")";
+    std::cerr << " [name: " << expression->disp() << "] ";
+    std::cerr << " [delayed: " << expression->is_delayed() << "] ";
+    std::cerr << " [interpolant: " << expression->is_interpolant() << "] ";
+    std::cerr << " hsla[" << expression->h() << ":"  << expression->s() << ":" << expression->l() << "@" << expression->a() << "]" << std::endl;
   } else if (Cast<Number>(node)) {
     Number_Ptr expression = Cast<Number>(node);
     std::cerr << ind << "Number " << expression;
diff --git a/src/eval.cpp b/src/eval.cpp
index 44e0e49e1..777ffb4af 100644
--- a/src/eval.cpp
+++ b/src/eval.cpp
@@ -631,7 +631,9 @@ namespace Sass {
         }
       }
       // lhs is number and rhs is color
-      else if (Color_Ptr r_c = Cast<Color>(rhs)) {
+      // Todo: allow to work with HSLA colors
+      else if (Color_Ptr r_col = Cast<Color>(rhs)) {
+        Color_RGBA_Obj r_c = r_col->toRGBA();
         try {
           switch (op_type) {
             case Sass_OP::EQ: return *l_n == *r_c ? bool_true : bool_false;
@@ -648,9 +650,11 @@ namespace Sass {
         }
       }
     }
-    else if (Color_Ptr l_c = Cast<Color>(lhs)) {
+    else if (Color_Ptr l_col = Cast<Color>(lhs)) {
+      Color_RGBA_Obj l_c = l_col->toRGBA();
       // lhs is color and rhs is color
-      if (Color_Ptr r_c = Cast<Color>(rhs)) {
+      if (Color_Ptr r_col = Cast<Color>(rhs)) {
+        Color_RGBA_Obj r_c = r_col->toRGBA();
         try {
           switch (op_type) {
             case Sass_OP::EQ: return *l_c == *r_c ? bool_true : bool_false;
@@ -834,17 +838,17 @@ namespace Sass {
       }
       else if (l_type == Expression::NUMBER && r_type == Expression::COLOR) {
         Number_Ptr l_n = Cast<Number>(lhs);
-        Color_Ptr r_c = Cast<Color>(rhs);
+        Color_RGBA_Obj r_c = Cast<Color>(rhs)->toRGBA();
         rv = Operators::op_number_color(op_type, *l_n, *r_c, options(), pstate);
       }
       else if (l_type == Expression::COLOR && r_type == Expression::NUMBER) {
-        Color_Ptr l_c = Cast<Color>(lhs);
+        Color_RGBA_Obj l_c = Cast<Color>(lhs)->toRGBA();
         Number_Ptr r_n = Cast<Number>(rhs);
         rv = Operators::op_color_number(op_type, *l_c, *r_n, options(), pstate);
       }
       else if (l_type == Expression::COLOR && r_type == Expression::COLOR) {
-        Color_Ptr l_c = Cast<Color>(lhs);
-        Color_Ptr r_c = Cast<Color>(rhs);
+        Color_RGBA_Obj l_c = Cast<Color>(lhs)->toRGBA();
+        Color_RGBA_Obj r_c = Cast<Color>(rhs)->toRGBA();
         rv = Operators::op_colors(op_type, *l_c, *r_c, options(), pstate);
       }
       else {
@@ -1151,7 +1155,12 @@ namespace Sass {
     return value.detach();
   }
 
-  Expression_Ptr Eval::operator()(Color_Ptr c)
+  Expression_Ptr Eval::operator()(Color_RGBA_Ptr c)
+  {
+    return c;
+  }
+
+  Expression_Ptr Eval::operator()(Color_HSLA_Ptr c)
   {
     return c;
   }
diff --git a/src/eval.hpp b/src/eval.hpp
index 3ba431a85..61ed1e2fc 100644
--- a/src/eval.hpp
+++ b/src/eval.hpp
@@ -58,7 +58,8 @@ namespace Sass {
     Expression_Ptr operator()(Function_Call_Ptr);
     Expression_Ptr operator()(Variable_Ptr);
     Expression_Ptr operator()(Number_Ptr);
-    Expression_Ptr operator()(Color_Ptr);
+    Expression_Ptr operator()(Color_RGBA_Ptr);
+    Expression_Ptr operator()(Color_HSLA_Ptr);
     Expression_Ptr operator()(Boolean_Ptr);
     Expression_Ptr operator()(String_Schema_Ptr);
     Expression_Ptr operator()(String_Quoted_Ptr);
diff --git a/src/fn_colors.cpp b/src/fn_colors.cpp
index 66876acb3..f074528dc 100644
--- a/src/fn_colors.cpp
+++ b/src/fn_colors.cpp
@@ -9,20 +9,31 @@ namespace Sass {
 
   namespace Functions {
 
-    bool special_number(String_Constant_Ptr s) {
+    bool string_argument(AST_Node_Obj obj) {
+      String_Constant_Ptr s = Cast<String_Constant>(obj);
       if (s == nullptr) return false;
       const std::string& str = s->value();
       return starts_with(str, "calc(") ||
              starts_with(str, "var(");
     }
 
+    void hsla_alpha_percent_deprecation(const ParserState& pstate, const std::string val)
+    {
+
+      std::string msg("Passing a percentage as the alpha value to hsla() will be interpreted");
+      std::string tail("differently in future versions of Sass. For now, use " + val + " instead.");
+
+      deprecated(msg, tail, false, pstate);
+
+    }
+
     Signature rgb_sig = "rgb($red, $green, $blue)";
     BUILT_IN(rgb)
     {
       if (
-        special_number(Cast<String_Constant>(env["$red"])) ||
-        special_number(Cast<String_Constant>(env["$green"])) ||
-        special_number(Cast<String_Constant>(env["$blue"]))
+        string_argument(env["$red"]) ||
+        string_argument(env["$green"]) ||
+        string_argument(env["$blue"])
       ) {
         return SASS_MEMORY_NEW(String_Constant, pstate, "rgb("
                                                         + env["$red"]->to_string()
@@ -34,7 +45,7 @@ namespace Sass {
         );
       }
 
-      return SASS_MEMORY_NEW(Color,
+      return SASS_MEMORY_NEW(Color_RGBA,
                              pstate,
                              COLOR_NUM("$red"),
                              COLOR_NUM("$green"),
@@ -45,10 +56,10 @@ namespace Sass {
     BUILT_IN(rgba_4)
     {
       if (
-        special_number(Cast<String_Constant>(env["$red"])) ||
-        special_number(Cast<String_Constant>(env["$green"])) ||
-        special_number(Cast<String_Constant>(env["$blue"])) ||
-        special_number(Cast<String_Constant>(env["$alpha"]))
+        string_argument(env["$red"]) ||
+        string_argument(env["$green"]) ||
+        string_argument(env["$blue"]) ||
+        string_argument(env["$alpha"])
       ) {
         return SASS_MEMORY_NEW(String_Constant, pstate, "rgba("
                                                         + env["$red"]->to_string()
@@ -62,7 +73,7 @@ namespace Sass {
         );
       }
 
-      return SASS_MEMORY_NEW(Color,
+      return SASS_MEMORY_NEW(Color_RGBA,
                              pstate,
                              COLOR_NUM("$red"),
                              COLOR_NUM("$green"),
@@ -74,7 +85,7 @@ namespace Sass {
     BUILT_IN(rgba_2)
     {
       if (
-        special_number(Cast<String_Constant>(env["$color"]))
+        string_argument(env["$color"])
       ) {
         return SASS_MEMORY_NEW(String_Constant, pstate, "rgba("
                                                         + env["$color"]->to_string()
@@ -84,10 +95,10 @@ namespace Sass {
         );
       }
 
-      Color_Ptr c_arg = ARG("$color", Color);
+      Color_RGBA_Obj c_arg = ARG("$color", Color)->toRGBA();
 
       if (
-        special_number(Cast<String_Constant>(env["$alpha"]))
+        string_argument(env["$alpha"])
       ) {
         std::stringstream strm;
         strm << "rgba("
@@ -99,7 +110,7 @@ namespace Sass {
         return SASS_MEMORY_NEW(String_Constant, pstate, strm.str());
       }
 
-      Color_Obj new_c = SASS_MEMORY_COPY(c_arg);
+      Color_RGBA_Obj new_c = SASS_MEMORY_COPY(c_arg);
       new_c->a(ALPHA_NUM("$alpha"));
       new_c->disp("");
       return new_c.detach();
@@ -111,30 +122,41 @@ namespace Sass {
 
     Signature red_sig = "red($color)";
     BUILT_IN(red)
-    { return SASS_MEMORY_NEW(Number, pstate, ARG("$color", Color)->r()); }
+    { 
+      Color_RGBA_Obj color = ARG("$color", Color)->toRGBA();
+      return SASS_MEMORY_NEW(Number, pstate, color->r());
+    }
 
     Signature green_sig = "green($color)";
     BUILT_IN(green)
-    { return SASS_MEMORY_NEW(Number, pstate, ARG("$color", Color)->g()); }
+    {
+      Color_RGBA_Obj color = ARG("$color", Color)->toRGBA();
+      return SASS_MEMORY_NEW(Number, pstate, color->g());
+    }
 
     Signature blue_sig = "blue($color)";
     BUILT_IN(blue)
-    { return SASS_MEMORY_NEW(Number, pstate, ARG("$color", Color)->b()); }
+    {
+      Color_RGBA_Obj color = ARG("$color", Color)->toRGBA();
+      return SASS_MEMORY_NEW(Number, pstate, color->b());
+    }
 
-    Color* colormix(Context& ctx, ParserState& pstate, Color* color1, Color* color2, double weight) {
+    Color_RGBA* colormix(Context& ctx, ParserState& pstate, Color* color1, Color* color2, double weight) {
+      Color_RGBA_Obj c1 = color1->toRGBA();
+      Color_RGBA_Obj c2 = color2->toRGBA();
       double p = weight/100;
       double w = 2*p - 1;
-      double a = color1->a() - color2->a();
+      double a = c1->a() - c2->a();
 
       double w1 = (((w * a == -1) ? w : (w + a)/(1 + w*a)) + 1)/2.0;
       double w2 = 1 - w1;
 
-      return SASS_MEMORY_NEW(Color,
+      return SASS_MEMORY_NEW(Color_RGBA,
                              pstate,
-                             Sass::round(w1*color1->r() + w2*color2->r(), ctx.c_options.precision),
-                             Sass::round(w1*color1->g() + w2*color2->g(), ctx.c_options.precision),
-                             Sass::round(w1*color1->b() + w2*color2->b(), ctx.c_options.precision),
-                             color1->a()*p + color2->a()*(1-p));
+                             Sass::round(w1*c1->r() + w2*c2->r(), ctx.c_options.precision),
+                             Sass::round(w1*c1->g() + w2*c2->g(), ctx.c_options.precision),
+                             Sass::round(w1*c1->b() + w2*c2->b(), ctx.c_options.precision),
+                             c1->a()*p + c2->a()*(1-p));
     }
 
     Signature mix_sig = "mix($color-1, $color-2, $weight: 50%)";
@@ -151,91 +173,13 @@ namespace Sass {
     // HSL FUNCTIONS
     ////////////////
 
-    // RGB to HSL helper function
-    struct HSL { double h; double s; double l; };
-    HSL rgb_to_hsl(double r, double g, double b)
-    {
-
-      // Algorithm from http://en.wikipedia.org/wiki/wHSL_and_HSV#Conversion_from_RGB_to_HSL_or_HSV
-      r /= 255.0; g /= 255.0; b /= 255.0;
-
-      double max = std::max(r, std::max(g, b));
-      double min = std::min(r, std::min(g, b));
-      double delta = max - min;
-
-      double h = 0;
-      double s;
-      double l = (max + min) / 2.0;
-
-      if (NEAR_EQUAL(max, min)) {
-        h = s = 0; // achromatic
-      }
-      else {
-        if (l < 0.5) s = delta / (max + min);
-        else         s = delta / (2.0 - max - min);
-
-        if      (r == max) h = (g - b) / delta + (g < b ? 6 : 0);
-        else if (g == max) h = (b - r) / delta + 2;
-        else if (b == max) h = (r - g) / delta + 4;
-      }
-
-      HSL hsl_struct;
-      hsl_struct.h = h / 6 * 360;
-      hsl_struct.s = s * 100;
-      hsl_struct.l = l * 100;
-
-      return hsl_struct;
-    }
-
-    // hue to RGB helper function
-    double h_to_rgb(double m1, double m2, double h) {
-      while (h < 0) h += 1;
-      while (h > 1) h -= 1;
-      if (h*6.0 < 1) return m1 + (m2 - m1)*h*6;
-      if (h*2.0 < 1) return m2;
-      if (h*3.0 < 2) return m1 + (m2 - m1) * (2.0/3.0 - h)*6;
-      return m1;
-    }
-
-    Color_Ptr hsla_impl(double h, double s, double l, double a, Context& ctx, ParserState pstate)
-    {
-      h /= 360.0;
-      s /= 100.0;
-      l /= 100.0;
-
-      if (l < 0) l = 0;
-      if (s < 0) s = 0;
-      if (l > 1) l = 1;
-      if (s > 1) s = 1;
-      while (h < 0) h += 1;
-      while (h > 1) h -= 1;
-
-      // if saturation is exacly zero, we loose
-      // information for hue, since it will evaluate
-      // to zero if converted back from rgb. Setting
-      // saturation to a very tiny number solves this.
-      if (s == 0) s = 1e-10;
-
-      // Algorithm from the CSS3 spec: http://www.w3.org/TR/css3-color/#hsl-color.
-      double m2;
-      if (l <= 0.5) m2 = l*(s+1.0);
-      else m2 = (l+s)-(l*s);
-      double m1 = (l*2.0)-m2;
-      // round the results -- consider moving this into the Color constructor
-      double r = (h_to_rgb(m1, m2, h + 1.0/3.0) * 255.0);
-      double g = (h_to_rgb(m1, m2, h) * 255.0);
-      double b = (h_to_rgb(m1, m2, h - 1.0/3.0) * 255.0);
-
-      return SASS_MEMORY_NEW(Color, pstate, r, g, b, a);
-    }
-
     Signature hsl_sig = "hsl($hue, $saturation, $lightness)";
     BUILT_IN(hsl)
     {
       if (
-        special_number(Cast<String_Constant>(env["$hue"])) ||
-        special_number(Cast<String_Constant>(env["$saturation"])) ||
-        special_number(Cast<String_Constant>(env["$lightness"]))
+        string_argument(env["$hue"]) ||
+        string_argument(env["$saturation"]) ||
+        string_argument(env["$lightness"])
       ) {
         return SASS_MEMORY_NEW(String_Constant, pstate, "hsl("
                                                         + env["$hue"]->to_string()
@@ -247,22 +191,23 @@ namespace Sass {
         );
       }
 
-      return hsla_impl(ARGVAL("$hue"),
-                       ARGVAL("$saturation"),
-                       ARGVAL("$lightness"),
-                       1.0,
-                       ctx,
-                       pstate);
+      return SASS_MEMORY_NEW(Color_HSLA,
+        pstate,
+        ARGVAL("$hue"),
+        ARGVAL("$saturation"),
+        ARGVAL("$lightness"),
+        1.0);
+
     }
 
     Signature hsla_sig = "hsla($hue, $saturation, $lightness, $alpha)";
     BUILT_IN(hsla)
     {
       if (
-        special_number(Cast<String_Constant>(env["$hue"])) ||
-        special_number(Cast<String_Constant>(env["$saturation"])) ||
-        special_number(Cast<String_Constant>(env["$lightness"])) ||
-        special_number(Cast<String_Constant>(env["$alpha"]))
+        string_argument(env["$hue"]) ||
+        string_argument(env["$saturation"]) ||
+        string_argument(env["$lightness"]) ||
+        string_argument(env["$alpha"])
       ) {
         return SASS_MEMORY_NEW(String_Constant, pstate, "hsla("
                                                         + env["$hue"]->to_string()
@@ -276,103 +221,82 @@ namespace Sass {
         );
       }
 
-      return hsla_impl(ARGVAL("$hue"),
-                       ARGVAL("$saturation"),
-                       ARGVAL("$lightness"),
-                       ARGVAL("$alpha"),
-                       ctx,
-                       pstate);
+      Number_Ptr alpha = ARG("$alpha", Number);
+      if (alpha && alpha->unit() == "%") {
+        Number_Obj val = SASS_MEMORY_COPY(alpha);
+        val->numerators.clear(); // convert
+        val->value(val->value() / 100.0);
+        std::string nr(val->to_string(ctx.c_options));
+        hsla_alpha_percent_deprecation(pstate, nr);
+      }
+
+      return SASS_MEMORY_NEW(Color_HSLA,
+        pstate,
+        ARGVAL("$hue"),
+        ARGVAL("$saturation"),
+        ARGVAL("$lightness"),
+        ARGVAL("$alpha"));
+
     }
 
+    /////////////////////////////////////////////////////////////////////////
+    // Query functions
+    /////////////////////////////////////////////////////////////////////////
+
     Signature hue_sig = "hue($color)";
     BUILT_IN(hue)
     {
-      Color_Ptr rgb_color = ARG("$color", Color);
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-      return SASS_MEMORY_NEW(Number, pstate, hsl_color.h, "deg");
+      Color_HSLA_Obj col = ARG("$color", Color)->toHSLA();
+      return SASS_MEMORY_NEW(Number, pstate, col->h(), "deg");
     }
 
     Signature saturation_sig = "saturation($color)";
     BUILT_IN(saturation)
     {
-      Color_Ptr rgb_color = ARG("$color", Color);
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-      return SASS_MEMORY_NEW(Number, pstate, hsl_color.s, "%");
+      Color_HSLA_Obj col = ARG("$color", Color)->toHSLA();
+      return SASS_MEMORY_NEW(Number, pstate, col->s(), "%");
     }
 
     Signature lightness_sig = "lightness($color)";
     BUILT_IN(lightness)
     {
-      Color_Ptr rgb_color = ARG("$color", Color);
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-      return SASS_MEMORY_NEW(Number, pstate, hsl_color.l, "%");
+      Color_HSLA_Obj col = ARG("$color", Color)->toHSLA();
+      return SASS_MEMORY_NEW(Number, pstate, col->l(), "%");
     }
 
+    /////////////////////////////////////////////////////////////////////////
+    // HSL manipulation functions
+    /////////////////////////////////////////////////////////////////////////
+
     Signature adjust_hue_sig = "adjust-hue($color, $degrees)";
     BUILT_IN(adjust_hue)
     {
-      Color_Ptr rgb_color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       double degrees = ARGVAL("$degrees");
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-      return hsla_impl(hsl_color.h + degrees,
-                       hsl_color.s,
-                       hsl_color.l,
-                       rgb_color->a(),
-                       ctx,
-                       pstate);
+      Color_HSLA_Obj copy = col->toHSLA(true);
+      copy->h(absmod(copy->h() + degrees, 360.0));
+      return copy.detach();
     }
 
     Signature lighten_sig = "lighten($color, $amount)";
     BUILT_IN(lighten)
     {
-      Color_Ptr rgb_color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       double amount = DARG_U_PRCT("$amount");
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-      //Check lightness is not negative before lighten it
-      double hslcolorL = hsl_color.l;
-      if (hslcolorL < 0) {
-        hslcolorL = 0;
-      }
+      Color_HSLA_Obj copy = col->toHSLA(true);
+      copy->l(clip(copy->l() + amount, 0.0, 100.0));
+      return copy.detach();
 
-      return hsla_impl(hsl_color.h,
-                       hsl_color.s,
-                       hslcolorL + amount,
-                       rgb_color->a(),
-                       ctx,
-                       pstate);
     }
 
     Signature darken_sig = "darken($color, $amount)";
     BUILT_IN(darken)
     {
-      Color_Ptr rgb_color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       double amount = DARG_U_PRCT("$amount");
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-
-      //Check lightness if not over 100, before darken it
-      double hslcolorL = hsl_color.l;
-      if (hslcolorL > 100) {
-        hslcolorL = 100;
-      }
-
-      return hsla_impl(hsl_color.h,
-                       hsl_color.s,
-                       hslcolorL - amount,
-                       rgb_color->a(),
-                       ctx,
-                       pstate);
+      Color_HSLA_Obj copy = col->toHSLA(true);
+      copy->l(clip(copy->l() - amount, 0.0, 100.0));
+      return copy.detach();
     }
 
     Signature saturate_sig = "saturate($color, $amount: false)";
@@ -383,55 +307,21 @@ namespace Sass {
         return SASS_MEMORY_NEW(String_Quoted, pstate, "saturate(" + env["$color"]->to_string(ctx.c_options) + ")");
       }
 
+      Color_Ptr col = ARG("$color", Color);
       double amount = DARG_U_PRCT("$amount");
-      Color_Ptr rgb_color = ARG("$color", Color);
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-
-      double hslcolorS = hsl_color.s + amount;
-
-      // Saturation cannot be below 0 or above 100
-      if (hslcolorS < 0) {
-        hslcolorS = 0;
-      }
-      if (hslcolorS > 100) {
-        hslcolorS = 100;
-      }
-
-      return hsla_impl(hsl_color.h,
-                       hslcolorS,
-                       hsl_color.l,
-                       rgb_color->a(),
-                       ctx,
-                       pstate);
+      Color_HSLA_Obj copy = col->toHSLA(true);
+      copy->s(clip(copy->s() + amount, 0.0, 100.0));
+      return copy.detach();
     }
 
     Signature desaturate_sig = "desaturate($color, $amount)";
     BUILT_IN(desaturate)
     {
-      Color_Ptr rgb_color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       double amount = DARG_U_PRCT("$amount");
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-
-      double hslcolorS = hsl_color.s - amount;
-
-      // Saturation cannot be below 0 or above 100
-      if (hslcolorS <= 0) {
-        hslcolorS = 0;
-      }
-      if (hslcolorS > 100) {
-        hslcolorS = 100;
-      }
-
-      return hsla_impl(hsl_color.h,
-                       hslcolorS,
-                       hsl_color.l,
-                       rgb_color->a(),
-                       ctx,
-                       pstate);
+      Color_HSLA_Obj copy = col->toHSLA(true);
+      copy->s(clip(copy->s() - amount, 0.0, 100.0));
+      return copy.detach();
     }
 
     Signature grayscale_sig = "grayscale($color)";
@@ -443,31 +333,23 @@ namespace Sass {
         return SASS_MEMORY_NEW(String_Quoted, pstate, "grayscale(" + amount->to_string(ctx.c_options) + ")");
       }
 
-      Color_Ptr rgb_color = ARG("$color", Color);
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-      return hsla_impl(hsl_color.h,
-                       0.0,
-                       hsl_color.l,
-                       rgb_color->a(),
-                       ctx,
-                       pstate);
+      Color_Ptr col = ARG("$color", Color);
+      Color_HSLA_Obj copy = col->toHSLA(true);
+      copy->s(0.0); // just reset saturation
+      return copy.detach();
     }
 
+    /////////////////////////////////////////////////////////////////////////
+    // Misc manipulation functions
+    /////////////////////////////////////////////////////////////////////////
+
     Signature complement_sig = "complement($color)";
     BUILT_IN(complement)
     {
-      Color_Ptr rgb_color = ARG("$color", Color);
-      HSL hsl_color = rgb_to_hsl(rgb_color->r(),
-                                 rgb_color->g(),
-                                 rgb_color->b());
-      return hsla_impl(hsl_color.h - 180.0,
-                       hsl_color.s,
-                       hsl_color.l,
-                       rgb_color->a(),
-                       ctx,
-                       pstate);
+      Color_Ptr col = ARG("$color", Color);
+      Color_HSLA_Obj copy = col->toHSLA(true);
+      copy->h(absmod(copy->h() - 180.0, 360.0));
+      return copy.detach();
     }
 
     Signature invert_sig = "invert($color, $weight: 100%)";
@@ -479,20 +361,19 @@ namespace Sass {
         return SASS_MEMORY_NEW(String_Quoted, pstate, "invert(" + amount->to_string(ctx.c_options) + ")");
       }
 
+      Color_Ptr col = ARG("$color", Color);
       double weight = DARG_U_PRCT("$weight");
-      Color_Ptr rgb_color = ARG("$color", Color);
-      Color_Obj inv = SASS_MEMORY_NEW(Color,
-                             pstate,
-                             255 - rgb_color->r(),
-                             255 - rgb_color->g(),
-                             255 - rgb_color->b(),
-                             rgb_color->a());
-      return colormix(ctx, pstate, inv, rgb_color, weight);
+      Color_RGBA_Obj inv = col->toRGBA(true);
+      inv->r(clip(255.0 - inv->r(), 0.0, 255.0));
+      inv->g(clip(255.0 - inv->g(), 0.0, 255.0));
+      inv->b(clip(255.0 - inv->b(), 0.0, 255.0));
+      return colormix(ctx, pstate, inv, col, weight);
     }
 
-    ////////////////////
-    // OPACITY FUNCTIONS
-    ////////////////////
+    /////////////////////////////////////////////////////////////////////////
+    // Opacity functions
+    /////////////////////////////////////////////////////////////////////////
+
     Signature alpha_sig = "alpha($color)";
     Signature opacity_sig = "opacity($color)";
     BUILT_IN(alpha)
@@ -515,30 +396,22 @@ namespace Sass {
     Signature fade_in_sig = "fade-in($color, $amount)";
     BUILT_IN(opacify)
     {
-      Color_Ptr color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       double amount = DARG_U_FACT("$amount");
-      double alpha = std::min(color->a() + amount, 1.0);
-      return SASS_MEMORY_NEW(Color,
-                             pstate,
-                             color->r(),
-                             color->g(),
-                             color->b(),
-                             alpha);
+      Color_Obj copy = SASS_MEMORY_COPY(col);
+      copy->a(clip(col->a() + amount, 0.0, 1.0));
+      return copy.detach();
     }
 
     Signature transparentize_sig = "transparentize($color, $amount)";
     Signature fade_out_sig = "fade-out($color, $amount)";
     BUILT_IN(transparentize)
     {
-      Color_Ptr color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       double amount = DARG_U_FACT("$amount");
-      double alpha = std::max(color->a() - amount, 0.0);
-      return SASS_MEMORY_NEW(Color,
-                             pstate,
-                             color->r(),
-                             color->g(),
-                             color->b(),
-                             alpha);
+      Color_Obj copy = SASS_MEMORY_COPY(col);
+      copy->a(std::max(col->a() - amount, 0.0));
+      return copy.detach();
     }
 
     ////////////////////////
@@ -548,7 +421,7 @@ namespace Sass {
     Signature adjust_color_sig = "adjust-color($color, $red: false, $green: false, $blue: false, $hue: false, $saturation: false, $lightness: false, $alpha: false)";
     BUILT_IN(adjust_color)
     {
-      Color_Ptr color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       Number_Ptr r = Cast<Number>(env["$red"]);
       Number_Ptr g = Cast<Number>(env["$green"]);
       Number_Ptr b = Cast<Number>(env["$blue"]);
@@ -563,47 +436,37 @@ namespace Sass {
       if (rgb && hsl) {
         error("Cannot specify HSL and RGB values for a color at the same time for `adjust-color'", pstate, traces);
       }
-      if (rgb) {
-        double rr = r ? DARG_R_BYTE("$red") : 0;
-        double gg = g ? DARG_R_BYTE("$green") : 0;
-        double bb = b ? DARG_R_BYTE("$blue") : 0;
-        double aa = a ? DARG_R_FACT("$alpha") : 0;
-        return SASS_MEMORY_NEW(Color,
-                               pstate,
-                               color->r() + rr,
-                               color->g() + gg,
-                               color->b() + bb,
-                               color->a() + aa);
-      }
-      if (hsl) {
-        HSL hsl_struct = rgb_to_hsl(color->r(), color->g(), color->b());
-        double ss = s ? DARG_R_PRCT("$saturation") : 0;
-        double ll = l ? DARG_R_PRCT("$lightness") : 0;
-        double aa = a ? DARG_R_FACT("$alpha") : 0;
-        return hsla_impl(hsl_struct.h + (h ? h->value() : 0),
-                         hsl_struct.s + ss,
-                         hsl_struct.l + ll,
-                         color->a() + aa,
-                         ctx,
-                         pstate);
-      }
-      if (a) {
-        return SASS_MEMORY_NEW(Color,
-                               pstate,
-                               color->r(),
-                               color->g(),
-                               color->b(),
-                               color->a() + (a ? a->value() : 0));
+      else if (rgb) {
+        Color_RGBA_Obj c = col->toRGBA(true);
+        if (r) c->r(c->r() + DARG_R_BYTE("$red"));
+        if (g) c->g(c->g() + DARG_R_BYTE("$green"));
+        if (b) c->b(c->b() + DARG_R_BYTE("$blue"));
+        if (a) c->a(c->a() + DARG_R_FACT("$alpha"));
+        return c.detach();
+      }
+      else if (hsl) {
+        Color_HSLA_Obj c = col->toHSLA(true);
+        if (h) c->h(c->h() + absmod(h->value(), 360.0));
+        if (s) c->s(c->s() + DARG_R_PRCT("$saturation"));
+        if (l) c->l(c->l() + DARG_R_PRCT("$lightness"));
+        if (a) c->a(c->a() + DARG_R_FACT("$alpha"));
+        return c.detach();
+      }
+      else if (a) {
+        Color_Obj c = SASS_MEMORY_COPY(col);
+        c->a(c->a() + DARG_R_FACT("$alpha"));
+        c->a(clip(c->a(), 0.0, 1.0));
+        return c.detach();
       }
       error("not enough arguments for `adjust-color'", pstate, traces);
       // unreachable
-      return color;
+      return col;
     }
 
     Signature scale_color_sig = "scale-color($color, $red: false, $green: false, $blue: false, $hue: false, $saturation: false, $lightness: false, $alpha: false)";
     BUILT_IN(scale_color)
     {
-      Color_Ptr color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       Number_Ptr r = Cast<Number>(env["$red"]);
       Number_Ptr g = Cast<Number>(env["$green"]);
       Number_Ptr b = Cast<Number>(env["$blue"]);
@@ -618,48 +481,46 @@ namespace Sass {
       if (rgb && hsl) {
         error("Cannot specify HSL and RGB values for a color at the same time for `scale-color'", pstate, traces);
       }
-      if (rgb) {
+      else if (rgb) {
+        Color_RGBA_Obj c = col->toRGBA(true);
         double rscale = (r ? DARG_R_PRCT("$red") : 0.0) / 100.0;
         double gscale = (g ? DARG_R_PRCT("$green") : 0.0) / 100.0;
         double bscale = (b ? DARG_R_PRCT("$blue") : 0.0) / 100.0;
         double ascale = (a ? DARG_R_PRCT("$alpha") : 0.0) / 100.0;
-        return SASS_MEMORY_NEW(Color,
-                               pstate,
-                               color->r() + rscale * (rscale > 0.0 ? 255 - color->r() : color->r()),
-                               color->g() + gscale * (gscale > 0.0 ? 255 - color->g() : color->g()),
-                               color->b() + bscale * (bscale > 0.0 ? 255 - color->b() : color->b()),
-                               color->a() + ascale * (ascale > 0.0 ? 1.0 - color->a() : color->a()));
-      }
-      if (hsl) {
+        if (rscale) c->r(c->r() + rscale * (rscale > 0.0 ? 255.0 - c->r() : c->r()));
+        if (gscale) c->g(c->g() + gscale * (gscale > 0.0 ? 255.0 - c->g() : c->g()));
+        if (bscale) c->b(c->b() + bscale * (bscale > 0.0 ? 255.0 - c->b() : c->b()));
+        if (ascale) c->a(c->a() + ascale * (ascale > 0.0 ? 1.0 - c->a() : c->a()));
+        return c.detach();
+      }
+      else if (hsl) {
+        Color_HSLA_Obj c = col->toHSLA(true);
         double hscale = (h ? DARG_R_PRCT("$hue") : 0.0) / 100.0;
         double sscale = (s ? DARG_R_PRCT("$saturation") : 0.0) / 100.0;
         double lscale = (l ? DARG_R_PRCT("$lightness") : 0.0) / 100.0;
         double ascale = (a ? DARG_R_PRCT("$alpha") : 0.0) / 100.0;
-        HSL hsl_struct = rgb_to_hsl(color->r(), color->g(), color->b());
-        hsl_struct.h += hscale * (hscale > 0.0 ? 360.0 - hsl_struct.h : hsl_struct.h);
-        hsl_struct.s += sscale * (sscale > 0.0 ? 100.0 - hsl_struct.s : hsl_struct.s);
-        hsl_struct.l += lscale * (lscale > 0.0 ? 100.0 - hsl_struct.l : hsl_struct.l);
-        double alpha = color->a() + ascale * (ascale > 0.0 ? 1.0 - color->a() : color->a());
-        return hsla_impl(hsl_struct.h, hsl_struct.s, hsl_struct.l, alpha, ctx, pstate);
-      }
-      if (a) {
-        double ascale = (DARG_R_PRCT("$alpha")) / 100.0;
-        return SASS_MEMORY_NEW(Color,
-                               pstate,
-                               color->r(),
-                               color->g(),
-                               color->b(),
-                               color->a() + ascale * (ascale > 0.0 ? 1.0 - color->a() : color->a()));
+        if (hscale) c->h(c->h() + hscale * (hscale > 0.0 ? 360.0 - c->h() : c->h()));
+        if (sscale) c->s(c->s() + sscale * (sscale > 0.0 ? 100.0 - c->l() : c->s()));
+        if (lscale) c->l(c->l() + lscale * (lscale > 0.0 ? 100.0 - c->l() : c->l()));
+        if (ascale) c->a(c->a() + ascale * (ascale > 0.0 ? 1.0 - c->a() : c->a()));
+        return c.detach();
+      }
+      else if (a) {
+        Color_Obj c = SASS_MEMORY_COPY(col);
+        double ascale = DARG_R_PRCT("$alpha") / 100.0;
+        c->a(c->a() + ascale * (ascale > 0.0 ? 1.0 - c->a() : c->a()));
+        c->a(clip(c->a(), 0.0, 1.0));
+        return c.detach();
       }
       error("not enough arguments for `scale-color'", pstate, traces);
       // unreachable
-      return color;
+      return col;
     }
 
     Signature change_color_sig = "change-color($color, $red: false, $green: false, $blue: false, $hue: false, $saturation: false, $lightness: false, $alpha: false)";
     BUILT_IN(change_color)
     {
-      Color_Ptr color = ARG("$color", Color);
+      Color_Ptr col = ARG("$color", Color);
       Number_Ptr r = Cast<Number>(env["$red"]);
       Number_Ptr g = Cast<Number>(env["$green"]);
       Number_Ptr b = Cast<Number>(env["$blue"]);
@@ -674,51 +535,41 @@ namespace Sass {
       if (rgb && hsl) {
         error("Cannot specify HSL and RGB values for a color at the same time for `change-color'", pstate, traces);
       }
-      if (rgb) {
-        return SASS_MEMORY_NEW(Color,
-                               pstate,
-                               r ? DARG_U_BYTE("$red") : color->r(),
-                               g ? DARG_U_BYTE("$green") : color->g(),
-                               b ? DARG_U_BYTE("$blue") : color->b(),
-                               a ? DARG_U_BYTE("$alpha") : color->a());
-      }
-      if (hsl) {
-        HSL hsl_struct = rgb_to_hsl(color->r(), color->g(), color->b());
-        if (h) hsl_struct.h = std::fmod(h->value(), 360.0);
-        if (s) hsl_struct.s = DARG_U_PRCT("$saturation");
-        if (l) hsl_struct.l = DARG_U_PRCT("$lightness");
-        double alpha = a ? DARG_U_FACT("$alpha") : color->a();
-        return hsla_impl(hsl_struct.h, hsl_struct.s, hsl_struct.l, alpha, ctx, pstate);
-      }
-      if (a) {
-        double alpha = DARG_U_FACT("$alpha");
-        return SASS_MEMORY_NEW(Color,
-                               pstate,
-                               color->r(),
-                               color->g(),
-                               color->b(),
-                               alpha);
+      else if (rgb) {
+        Color_RGBA_Obj c = col->toRGBA(true);
+        if (r) c->r(DARG_U_BYTE("$red"));
+        if (g) c->g(DARG_U_BYTE("$green"));
+        if (b) c->b(DARG_U_BYTE("$blue"));
+        if (a) c->a(DARG_U_FACT("$alpha"));
+        return c.detach();
+      }
+      else if (hsl) {
+        Color_HSLA_Obj c = col->toHSLA(true);
+        if (h) c->h(absmod(h->value(), 360.0));
+        if (s) c->s(DARG_U_PRCT("$saturation"));
+        if (l) c->l(DARG_U_PRCT("$lightness"));
+        if (a) c->a(DARG_U_FACT("$alpha"));
+        return c.detach();
+      }
+      else if (a) {
+        Color_Obj c = SASS_MEMORY_COPY(col);
+        c->a(clip(DARG_U_FACT("$alpha"), 0.0, 1.0));
+        return c.detach();
       }
       error("not enough arguments for `change-color'", pstate, traces);
       // unreachable
-      return color;
-    }
-
-    template <size_t range>
-    static double cap_channel(double c) {
-      if      (c > range) return range;
-      else if (c < 0)     return 0;
-      else                return c;
+      return col;
     }
 
     Signature ie_hex_str_sig = "ie-hex-str($color)";
     BUILT_IN(ie_hex_str)
     {
-      Color_Ptr c = ARG("$color", Color);
-      double r = cap_channel<0xff>(c->r());
-      double g = cap_channel<0xff>(c->g());
-      double b = cap_channel<0xff>(c->b());
-      double a = cap_channel<1>   (c->a()) * 255;
+      Color_Ptr col = ARG("$color", Color);
+      Color_RGBA_Obj c = col->toRGBA();
+      double r = clip(c->r(), 0.0, 255.0);
+      double g = clip(c->g(), 0.0, 255.0);
+      double b = clip(c->b(), 0.0, 255.0);
+      double a = clip(c->a(), 0.0, 1.0) * 255.0;
 
       std::stringstream ss;
       ss << '#' << std::setw(2) << std::setfill('0');
diff --git a/src/inspect.cpp b/src/inspect.cpp
index 9d5ce1685..176d75bfc 100644
--- a/src/inspect.cpp
+++ b/src/inspect.cpp
@@ -571,7 +571,7 @@ namespace Sass {
     else                return c;
   }
 
-  void Inspect::operator()(Color_Ptr c)
+  void Inspect::operator()(Color_RGBA_Ptr c)
   {
     // output the final token
     std::stringstream ss;
@@ -590,7 +590,7 @@ namespace Sass {
 
     // get color from given name (if one was given at all)
     if (name != "" && name_to_color(name)) {
-      Color_Ptr_Const n = name_to_color(name);
+      Color_RGBA_Ptr_Const n = name_to_color(name);
       r = Sass::round(cap_channel<0xff>(n->r()), opt.precision);
       g = Sass::round(cap_channel<0xff>(n->g()), opt.precision);
       b = Sass::round(cap_channel<0xff>(n->b()), opt.precision);
@@ -657,6 +657,12 @@ namespace Sass {
 
   }
 
+  void Inspect::operator()(Color_HSLA_Ptr c)
+  {
+    Color_RGBA_Obj rgba = c->toRGBA();
+    operator()(rgba);
+  }
+
   void Inspect::operator()(Boolean_Ptr b)
   {
     // output the final token
diff --git a/src/inspect.hpp b/src/inspect.hpp
index 223be17ce..cda9234a8 100644
--- a/src/inspect.hpp
+++ b/src/inspect.hpp
@@ -55,7 +55,8 @@ namespace Sass {
     // virtual void operator()(Custom_Error_Ptr);
     virtual void operator()(Variable_Ptr);
     virtual void operator()(Number_Ptr);
-    virtual void operator()(Color_Ptr);
+    virtual void operator()(Color_RGBA_Ptr);
+    virtual void operator()(Color_HSLA_Ptr);
     virtual void operator()(Boolean_Ptr);
     virtual void operator()(String_Schema_Ptr);
     virtual void operator()(String_Constant_Ptr);
diff --git a/src/operation.hpp b/src/operation.hpp
index 71e13dcf9..7d5a7a5b9 100644
--- a/src/operation.hpp
+++ b/src/operation.hpp
@@ -81,6 +81,8 @@ namespace Sass {
     virtual T operator()(Variable_Ptr x)               = 0;
     virtual T operator()(Number_Ptr x)                 = 0;
     virtual T operator()(Color_Ptr x)                  = 0;
+    virtual T operator()(Color_RGBA_Ptr x)             = 0;
+    virtual T operator()(Color_HSLA_Ptr x)             = 0;
     virtual T operator()(Boolean_Ptr x)                = 0;
     virtual T operator()(String_Schema_Ptr x)          = 0;
     virtual T operator()(String_Quoted_Ptr x)          = 0;
@@ -162,6 +164,8 @@ namespace Sass {
     T operator()(Variable_Ptr x)               { return static_cast<D*>(this)->fallback(x); }
     T operator()(Number_Ptr x)                 { return static_cast<D*>(this)->fallback(x); }
     T operator()(Color_Ptr x)                  { return static_cast<D*>(this)->fallback(x); }
+    T operator()(Color_RGBA_Ptr x)             { return static_cast<D*>(this)->fallback(x); }
+    T operator()(Color_HSLA_Ptr x)             { return static_cast<D*>(this)->fallback(x); }
     T operator()(Boolean_Ptr x)                { return static_cast<D*>(this)->fallback(x); }
     T operator()(String_Schema_Ptr x)          { return static_cast<D*>(this)->fallback(x); }
     T operator()(String_Constant_Ptr x)        { return static_cast<D*>(this)->fallback(x); }
diff --git a/src/operators.cpp b/src/operators.cpp
index a1fd56235..8de59937b 100644
--- a/src/operators.cpp
+++ b/src/operators.cpp
@@ -57,12 +57,7 @@ namespace Sass {
     /* colour math deprecation warning */
     void op_color_deprecation(enum Sass_OP op, std::string lsh, std::string rhs, const ParserState& pstate)
     {
-      std::string op_str(
-        op == Sass_OP::ADD ? "plus" :
-          op == Sass_OP::DIV ? "div" :
-            op == Sass_OP::SUB ? "minus" :
-              op == Sass_OP::MUL ? "times" : ""
-      );
+      std::string op_str(sass_op_to_name(op));
 
       std::string msg("The operation `" + lsh + " " + op_str + " " + rhs + "` is deprecated and will be an error in future versions.");
       std::string tail("Consider using Sass's color functions instead.\nhttp://sass-lang.com/documentation/Sass/Script/Functions.html#other_color_functions");
@@ -120,8 +115,9 @@ namespace Sass {
       return SASS_MEMORY_NEW(String_Constant, pstate, lstr + sep + rstr);
     }
 
+    /* ToDo: allow to operate also with hsla colors */
     /* static function, throws OperationError, has no traces but optional pstate for returned value */
-    Value_Ptr op_colors(enum Sass_OP op, const Color& lhs, const Color& rhs, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed)
+    Value_Ptr op_colors(enum Sass_OP op, const Color_RGBA& lhs, const Color_RGBA& rhs, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed)
     {
 
       if (lhs.a() != rhs.a()) {
@@ -133,7 +129,7 @@ namespace Sass {
 
       op_color_deprecation(op, lhs.to_string(), rhs.to_string(), pstate);
 
-      return SASS_MEMORY_NEW(Color,
+      return SASS_MEMORY_NEW(Color_RGBA,
                              pstate,
                              ops[op](lhs.r(), rhs.r()),
                              ops[op](lhs.g(), rhs.g()),
@@ -212,7 +208,7 @@ namespace Sass {
     }
 
     /* static function, throws OperationError, has no traces but optional pstate for returned value */
-    Value_Ptr op_number_color(enum Sass_OP op, const Number& lhs, const Color& rhs, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed)
+    Value_Ptr op_number_color(enum Sass_OP op, const Number& lhs, const Color_RGBA& rhs, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed)
     {
       double lval = lhs.value();
 
@@ -220,7 +216,7 @@ namespace Sass {
         case Sass_OP::ADD:
         case Sass_OP::MUL: {
           op_color_deprecation(op, lhs.to_string(), rhs.to_string(opt), pstate);
-          return SASS_MEMORY_NEW(Color,
+          return SASS_MEMORY_NEW(Color_RGBA,
                                 pstate,
                                 ops[op](lval, rhs.r()),
                                 ops[op](lval, rhs.g()),
@@ -243,7 +239,7 @@ namespace Sass {
     }
 
     /* static function, throws OperationError, has no traces but optional pstate for returned value */
-    Value_Ptr op_color_number(enum Sass_OP op, const Color& lhs, const Number& rhs, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed)
+    Value_Ptr op_color_number(enum Sass_OP op, const Color_RGBA& lhs, const Number& rhs, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed)
     {
       double rval = rhs.value();
 
@@ -254,7 +250,7 @@ namespace Sass {
 
       op_color_deprecation(op, lhs.to_string(), rhs.to_string(), pstate);
 
-      return SASS_MEMORY_NEW(Color,
+      return SASS_MEMORY_NEW(Color_RGBA,
                             pstate,
                             ops[op](lhs.r(), rval),
                             ops[op](lhs.g(), rval),
diff --git a/src/operators.hpp b/src/operators.hpp
index f89eb4ee2..82387d266 100644
--- a/src/operators.hpp
+++ b/src/operators.hpp
@@ -18,10 +18,10 @@ namespace Sass {
     bool gte(Expression_Obj, Expression_Obj);
     // arithmetic for all the combinations that matter
     Value_Ptr op_strings(Sass::Operand, Value&, Value&, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed = false);
-    Value_Ptr op_colors(enum Sass_OP, const Color&, const Color&, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed = false);
+    Value_Ptr op_colors(enum Sass_OP, const Color_RGBA&, const Color_RGBA&, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed = false);
     Value_Ptr op_numbers(enum Sass_OP, const Number&, const Number&, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed = false);
-    Value_Ptr op_number_color(enum Sass_OP, const Number&, const Color&, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed = false);
-    Value_Ptr op_color_number(enum Sass_OP, const Color&, const Number&, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed = false);
+    Value_Ptr op_number_color(enum Sass_OP, const Number&, const Color_RGBA&, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed = false);
+    Value_Ptr op_color_number(enum Sass_OP, const Color_RGBA&, const Number&, struct Sass_Inspect_Options opt, const ParserState& pstate, bool delayed = false);
 
   };
 
diff --git a/src/parser.cpp b/src/parser.cpp
index c4ee0883f..f70f6f398 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -1594,7 +1594,7 @@ namespace Sass {
 
   Value_Ptr Parser::lexed_hex_color(const ParserState& pstate, const std::string& parsed)
   {
-    Color_Ptr color = NULL;
+    Color_RGBA_Ptr color = NULL;
     if (parsed[0] != '#') {
       return SASS_MEMORY_NEW(String_Quoted, pstate, parsed);
     }
@@ -1604,7 +1604,7 @@ namespace Sass {
       std::string r(2, parsed[1]);
       std::string g(2, parsed[2]);
       std::string b(2, parsed[3]);
-      color = SASS_MEMORY_NEW(Color,
+      color = SASS_MEMORY_NEW(Color_RGBA,
                                pstate,
                                static_cast<double>(strtol(r.c_str(), NULL, 16)),
                                static_cast<double>(strtol(g.c_str(), NULL, 16)),
@@ -1617,7 +1617,7 @@ namespace Sass {
       std::string g(2, parsed[2]);
       std::string b(2, parsed[3]);
       std::string a(2, parsed[4]);
-      color = SASS_MEMORY_NEW(Color,
+      color = SASS_MEMORY_NEW(Color_RGBA,
                                pstate,
                                static_cast<double>(strtol(r.c_str(), NULL, 16)),
                                static_cast<double>(strtol(g.c_str(), NULL, 16)),
@@ -1629,7 +1629,7 @@ namespace Sass {
       std::string r(parsed.substr(1,2));
       std::string g(parsed.substr(3,2));
       std::string b(parsed.substr(5,2));
-      color = SASS_MEMORY_NEW(Color,
+      color = SASS_MEMORY_NEW(Color_RGBA,
                                pstate,
                                static_cast<double>(strtol(r.c_str(), NULL, 16)),
                                static_cast<double>(strtol(g.c_str(), NULL, 16)),
@@ -1642,7 +1642,7 @@ namespace Sass {
       std::string g(parsed.substr(3,2));
       std::string b(parsed.substr(5,2));
       std::string a(parsed.substr(7,2));
-      color = SASS_MEMORY_NEW(Color,
+      color = SASS_MEMORY_NEW(Color_RGBA,
                                pstate,
                                static_cast<double>(strtol(r.c_str(), NULL, 16)),
                                static_cast<double>(strtol(g.c_str(), NULL, 16)),
@@ -1658,7 +1658,7 @@ namespace Sass {
   Value_Ptr Parser::color_or_string(const std::string& lexed) const
   {
     if (auto color = name_to_color(lexed)) {
-      auto c = SASS_MEMORY_NEW(Color, color);
+      auto c = SASS_MEMORY_NEW(Color_RGBA, color);
       c->is_delayed(true);
       c->pstate(pstate);
       c->disp(lexed);
diff --git a/src/sass_values.cpp b/src/sass_values.cpp
index 4927ee20d..5a007df25 100644
--- a/src/sass_values.cpp
+++ b/src/sass_values.cpp
@@ -318,17 +318,23 @@ extern "C" {
       }
       else if (sass_value_is_number(a) && sass_value_is_color(a)) {
         Number_Ptr_Const l_n = Cast<Number>(lhs);
-        Color_Ptr_Const r_c = Cast<Color>(rhs);
+        // Direct HSLA operations are not supported
+        // All color maths will be deprecated anyway
+        Color_RGBA_Obj r_c = Cast<Color>(rhs)->toRGBA();
         rv = Operators::op_number_color(op, *l_n, *r_c, options, l_n->pstate());
       }
       else if (sass_value_is_color(a) && sass_value_is_number(b)) {
-        Color_Ptr_Const l_c = Cast<Color>(lhs);
+        // Direct HSLA operations are not supported
+        // All color maths will be deprecated anyway
+        Color_RGBA_Obj l_c = Cast<Color>(lhs)->toRGBA();
         Number_Ptr_Const r_n = Cast<Number>(rhs);
         rv = Operators::op_color_number(op, *l_c, *r_n, options, l_c->pstate());
       }
       else if (sass_value_is_color(a) && sass_value_is_color(b)) {
-        Color_Ptr_Const l_c = Cast<Color>(lhs);
-        Color_Ptr_Const r_c = Cast<Color>(rhs);
+        // Direct HSLA operations are not supported
+        // All color maths will be deprecated anyway
+        Color_RGBA_Obj l_c = Cast<Color>(lhs)->toRGBA();
+        Color_RGBA_Obj r_c = Cast<Color>(rhs)->toRGBA();
         rv = Operators::op_colors(op, *l_c, *r_c, options, l_c->pstate());
       }
       else /* convert other stuff to string and apply operation */ {
diff --git a/src/to_value.cpp b/src/to_value.cpp
index f94c09a69..fae6fffe3 100644
--- a/src/to_value.cpp
+++ b/src/to_value.cpp
@@ -29,7 +29,13 @@ namespace Sass {
   }
 
   // Color is a valid value
-  Value_Ptr To_Value::operator()(Color_Ptr c)
+  Value_Ptr To_Value::operator()(Color_RGBA_Ptr c)
+  {
+    return c;
+  }
+
+  // Color is a valid value
+  Value_Ptr To_Value::operator()(Color_HSLA_Ptr c)
   {
     return c;
   }
diff --git a/src/to_value.hpp b/src/to_value.hpp
index ba422b3d4..625a6052e 100644
--- a/src/to_value.hpp
+++ b/src/to_value.hpp
@@ -24,7 +24,8 @@ namespace Sass {
     Value_Ptr operator()(Argument_Ptr);
     Value_Ptr operator()(Boolean_Ptr);
     Value_Ptr operator()(Number_Ptr);
-    Value_Ptr operator()(Color_Ptr);
+    Value_Ptr operator()(Color_RGBA_Ptr);
+    Value_Ptr operator()(Color_HSLA_Ptr);
     Value_Ptr operator()(String_Constant_Ptr);
     Value_Ptr operator()(String_Quoted_Ptr);
     Value_Ptr operator()(Custom_Warning_Ptr);
diff --git a/src/util.hpp b/src/util.hpp
index 3c463eed1..e98a74246 100644
--- a/src/util.hpp
+++ b/src/util.hpp
@@ -1,18 +1,32 @@
 #ifndef SASS_UTIL_H
 #define SASS_UTIL_H
 
+#include "sass.hpp"
+#include "sass/base.h"
+#include "ast_fwd_decl.hpp"
+
 #include <cstring>
 #include <vector>
 #include <string>
 #include <assert.h>
-#include "sass.hpp"
-#include "sass/base.h"
-#include "ast_fwd_decl.hpp"
+#include <math.h>
 
 #define SASS_ASSERT(cond, msg) assert(cond && msg)
 
 namespace Sass {
 
+  template <typename T>
+  T clip(const T& n, const T& lower, const T& upper) {
+    return std::max(lower, std::min(n, upper));
+  }
+
+  template <typename T>
+  T absmod(const T& n, const T& r) {
+    T m = std::fmod(n, r);
+    if (m < 0.0) m += r;
+    return m;
+  }
+
   double round(double val, size_t precision = 0);
   double sass_strtod(const char* str);
   const char* safe_str(const char *, const char* = "");
diff --git a/src/values.cpp b/src/values.cpp
index 0f2fd48d7..f840e6033 100644
--- a/src/values.cpp
+++ b/src/values.cpp
@@ -16,7 +16,8 @@ namespace Sass {
     }
     else if (val->concrete_type() == Expression::COLOR)
     {
-      Color_Ptr_Const col = Cast<Color>(val);
+      // ToDo: allow to also use HSLA colors!!
+      Color_RGBA_Obj col = Cast<Color>(val)->toRGBA();
       return sass_make_color(col->r(), col->g(), col->b(), col->a());
     }
     else if (val->concrete_type() == Expression::LIST)
@@ -78,7 +79,8 @@ namespace Sass {
                                ParserState("[C-VALUE]"),
                                sass_boolean_get_value(val));
       case SASS_COLOR:
-        return SASS_MEMORY_NEW(Color,
+        // ToDo: allow to also use HSLA colors!!
+        return SASS_MEMORY_NEW(Color_RGBA,
                                ParserState("[C-VALUE]"),
                                sass_color_get_r(val),
                                sass_color_get_g(val),