You probably already know this, so this is only a reminder: the three primary colors are.... very good! red, blue and yellow. And the three secondary colors? Excellent! : orange, violet, and green! And the tertiary colors? a little help: red-orange, yellow-orange, yellow-green, blue-green, blue-violet, red-violet. Now the complementary colors: red/green, blue/orange, and yellow/violet. Always remember the complementary colors are at OPPOSITE ends on the color wheel. Complementary colors are very important, and it is useful to place them close to one another, to make that area brighter and more intense. Remember the colors you use can affect the mood or feelings about a subject.