User defined color name

[Br. Samuel Springuel]

Is there a way to define a new color name for use with \with-color in 
markups?

I have a particular color which I'm trying to match and while I have 
it's RGB profile and can use \with-color #(rgb-color 0.898 0.208 0.172) 
each time, if I later decide that I need to adjust those numbers to get 
a better match, I have to track down each instance of the explicit color 
definition to make the adjustment.  I'm hoping that I can define a 
custom name and then use \with-color #customname when I need the color, 
allowing me to change all instances of the color in one place.  Is it 
possible to do this?
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Br. Samuel, OSB
St. Anselm’s Abbey
Washington, DC
(R. Padraic Springuel)

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