Colour is a mental creation. Going with the materialist view; light enters the eyes and a signal is sent to the brain, upon which the brain creates an image. It is the brain image that is seen and experienced. We can call that brain created image whatever we want, but the entire process from beginning to end is a mental one.
Meaning, the idea that light enters the eye is also mental. So the whole (materialist) explanation is circular and completely fails to explain sight, or how supposed independent objects, such as tables become ?'experiences' existing with'in' an organises mind, i.e. they don't.
And as per the Q, of course colour exists without light, e .g. night dreams have colour.
And you know the interior of the scull is quite a dark place. The brain sits in darkness and imagines light, not only in night dreams
..
So
Wake Up from the bright light of day
.