Black and white are not colors.
Value is "the relative degree of lightness or darkness of a particular color." White is pure lightness and black is pure darkness. Intensity is the strength and vividness of a color. To change the intensity and value of other colors you must add black and white. Therefore, black and white are only tools used to modify other colors.
Primary colors are red, yellow and blue. Tertiary colors are made by mixing equal parts of one primary color and one secondary color. There are six tertiary colors yellow-orange, red-orange, red-violet, blue-violet, blue-green, and yellow-green.
