That's a difficult question to answer. Unlike other variables such as temperature, color is not a physical property but rather the result of the interaction between the light that an object reflects, absorbs or transmits and the visual system of the viewer. The latter is very important, because the visual systems of different species vary greatly. Thus, feathers will look very different to a quail and to a human. To answer your question, first you need to identify the relevant viewer, which in many biologically interesting interactions, will not be a human.

This question is not totally clear to me.