Complementary colors are any two colors that combine to make white light. Any color can be described in terms of the combination of red, green, or blue (the "additive" primary colors) that has the same effect on the eyes. Since re, green, and blue in the right proportions add to make white, it follows that the complementary colors of red is blue-green (cyan), of blue is yellow (which is produced by red and green combined), and of green is magenta (red-blue). In painting, combinations of colors get darker, not lighter. It remains true, however, that complementary colors tend to neutralize each other.