As you'll probably remember from grade school, the three primary colors are yellow, red, and blue. The remaining six colors are tertiary and are created by mixing a primary and secondary color. Relationships between colors on the wheel are either complementary, analogous, or triadic. Complementary colors are directly across the color wheel from one another. This direct opposition of color sets up a strong, bold dynamic, as the colors will resonate, especially if they are juxtaposed.
Analogous compositions are harmonious because two of the colors contain the third.
Because of their relationship around the color wheel, triadic colors can be very balanced. How Are Colors Specified On the Web, you can specify colors exactly in two ways. The document will draw the same way with Internet Explorer, with the exception of the visited link, which is green. LINK is a link that has not yet been followed. In this example, the background is white, the text is black, links are red, visited links are blue, and active links are green.