The meaningfulness of the colors:

RED stimulates brain wave activity, increases heart rate, respirations and blood pressure, excites sexual glands. It energizes the first chakra (coccyx). It warms us and awakens us physically and energizes our blood. It is a good color to wear when we have colds and poor circulation. Too much red can over stimulate and make some illnesses worse. High blood pressure is an indicator of too much red energy in the body. It is a color for war, prosperity, fire, and rising sun. Spiritually it is the root color of fire and connects us to our physical self.

Black: self-confidence, power, strength