How to determine what color an object will appear in non-white light?

Question

How to determine what color an object will appear in non-white light?

Answer 1

Match the spectral composition of the light with the absorption spectrum of the object.

Answer 2

use the color wheel.

for example, the object is red, then you use yellow light,

red + yellow = orange

when 2 primary colors are mixed, you'll have a secondary color...

created by mixing either all three primary colors or a primary and secondary color will result to a tertiary color.

Answer 3

It can either absorb it and look black, or reflect it and look various shades of that non-white.