Apon rereading your post I see that perhaps it was getting the exact 
colors that was your concern.

When dealing with compound colors like orange I sometimes find it 
helpful to compose macros which isolate how the color is varied, if for 
no other reason than to organize my mind

One such macro I find useful goes something like this:

#macro Desaturate ( Color, Factor )

         #local Compliment = <1,1,1>-Color;
         #local Compliment = Compliment*Factor;
         #local NewColor = Color+Compliment;
         #local Numerator = Color.red + Color.green + Color.blue;
         #local Denominator = NewColor.red + NewColor.green + 		 
NewColor.blue;
         #local NewColor = NewColor*Numerator/Denominator;

         NewColor
#end

This macro is intended to desaturate a color while maintaining its basic 
level of brightness.  Advanced users might wince but I find macros like 
these can help me zero in on a color.

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