Ugh. What kind of black hole of philosophical infinity did you drag me in too lol!

There are some interesting things to say here in response to other comments, but as to the OP I will say I haven't found too much regarding colors in my investigations. To be fair, I haven't looked at all either.

I remember seeing some stuff when looking into MKUltra, subliminal mind control, etc., but not a lot, and I don't remember the specifics. I've been delving deeply into how words can be strung together to create our reality (lower case), and all that that implies, That includes specific cases of fuckery that would surprise many people; i.e. multiple levels of The Matrix.

Not to say I don't think there is anything interesting regarding colors. I have no doubt that there is much there worth exploring, I just haven't looked yet.

As for colors' relationship to Psychology/Magic/Occult/Kabbalah/Religion, etc. I have not much more to add beyond what was posted in the OP. It is a very interesting topic however.