Complementary colors are opposites on the color wheel; for example, red is opposite green. Complements can be used in many ways. Mixed together in equal amounts, complements become gray. For shadows, it is always better to mix a color with its complement rather than adding black.
A complementary color can also be used to make another color stand out; for instance, to make the color red stand out, place green next to it. This is used most frequently when working with flowers and nature. Because almost all stems and leaves are green and many flowers are red or pink, the flowers have a very natural way of standing out.
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