Color correspondence is the way that the use of color will affect your magickal workings. From the color of the candles that you use to the color of clothes that you wear
It should be noted that this type of correspondence is not just associated with pagan followings or metaphysics. There is scientific evidence about the relationship of color to mood, success and growth. In many penal systems, when an inmate acts out of line (eq. gets in a fight), they are put into a “pink room” for a short time. This, under short duration, is said to calm the suspect. But long time exposure to pinks or reds can have exactly the opposite effect.