diff --git a/Source/NSColor.m b/Source/NSColor.m
index 474829248..2b728e5c3 100644
--- a/Source/NSColor.m
+++ b/Source/NSColor.m
@@ -2361,6 +2361,27 @@ static	NSRecursiveLock		*namedColorLock = nil;
     *alpha = _alpha_component;
 }
 
+- (NSUInteger) hash
+{
+  union {
+    uint8_t	bytes[sizeof(float)*5];
+    float	floats[5];
+  } u;
+  NSUInteger	h = 0;
+  unsigned	i;
+
+  u.floats[0] = _cyan_component;
+  u.floats[1] = _magenta_component;
+  u.floats[2] = _yellow_component;
+  u.floats[3] = _black_component;
+  u.floats[4] = _alpha_component;
+  for (i = 0; i < sizeof(u); i++)
+    {
+      h = (h << 5) + h + u.bytes[i];
+    }
+  return h;
+}
+
 - (BOOL) isEqual: (id)other
 {
   if (other == self)
@@ -2600,6 +2621,25 @@ static	NSRecursiveLock		*namedColorLock = nil;
     *alpha = _alpha_component;
 }
 
+- (NSUInteger) hash
+{
+  union {
+    uint8_t	bytes[sizeof(float)*3];
+    float	floats[3];
+  } u;
+  NSUInteger	h = 0;
+  unsigned	i;
+
+  u.floats[0] = _red_component;
+  u.floats[1] = _green_component;
+  u.floats[2] = _blue_component;
+  for (i = 0; i < sizeof(u); i++)
+    {
+      h = (h << 5) + h + u.bytes[i];
+    }
+  return h;
+}
+
 - (BOOL) isEqual: (id)other
 {
   if (other == self)
@@ -3104,6 +3144,11 @@ static	NSRecursiveLock		*namedColorLock = nil;
   return desc;
 }
 
+- (NSUInteger) hash
+{
+  return [_pattern hash];
+}
+
 - (BOOL) isEqual: (id)other
 {
   if (other == self)