Remember when you are using color that not everyone will see it as you do. Some individuals do not perceive color at all; others perceive color in a variety of ways, especially colors like blue and green, which are close together on the color spectrum. When putting colors next to one another, then, use those on opposite sides of the color spectrum, such as purple and gold, in order to achieve high contrast. Doing so will allow readers to see the contrast, if not the nuances, of color.