The rest are considered intermediates, or tertiary colors. Each of the primary, secondary and intermediate colors described above is at a level of full-saturation or brightness, when there is no black, white or gray added to the color. Understanding the dimensions of color is important, so that you can manipulate them to your advantage. For example, there are several color rules that apply when you want to change a color's hue. Mix a primary with one of its nearby secondaries to create an intermediate color.
Complementary colors are directly across from one another on the color wheel.
In addition to these hue-related rules, there are also rules for changing a color's value and intensity. Mix two hues if you want to reduce intensity. Add black or white to any hue to reduce intensity and change value. Add a lighter-value gray to a color to reduce intensity and create depth. Add an equal-value gray to reduce intensity without changing value.