The color wheel shows the relationships between colors. There are three primary colors - red, blue, and yellow. Secondary colors are created by mixing two primary colors: yellow + blue = green; red + yellow = orange; blue + red = purple. Tertiary colors are created by mixing a primary and a secondary color. The color wheel also shows how to create tints, shades, and tones of colors by mixing them with white, black, or gray. There are different color schemes including monochromatic, complementary, split-complementary, analogous, and color triads.