Red, green and blue are known as “three primary colors” of lights and when these all three colors are mixed the result is white. The colors that are pair of opposite side in the right “color circle” are called “complementary colors”. For example, red and cyan, green and magenta and blue and yellow are the pairs of complementary colors. When these two complementary colors are mixed together, it also makes white.
The colors which yields white by adding all three primary colors are called additive colors, e.g. the three primary colors of lights. Conversely, the colors which yields black by adding all three primary colors are called subtractive colors.
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