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Just because I am not a professional, licensed colorist doesn’t mean I have no idea, but I am also not going to discuss it in detail online where many will blame it for their screw ups. Plus, if there is a screw up or unexpected issue with my hair color, if I do it myself, no one to blame and no extra money wasted on someone else making the mistake. Physics and chemistry play parts in how humans perceive not just color, but anyaspect of visual content. The way light behaves and interacts with matter determines how our eyes work.
The reaction to light stimulus is chemical in nature and so carries the impulses caused by the act of looking to our brain and there chemical reactions are used both in cognition and memory. Which in turn is why humans were able to start to piece together all of the concepts incorporated into this question: color, color theory, physics and chemistry. Color theory is a matter of how the rods and cones of the retina are stimulated when adjacent but discrete pigmentation are small enough that human vision blends them together.