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Primary colors

Color theory asserts three pure primary colors that can be used to mix all possible colors. These are sometimes considered as red, yellow and blue (RYB) or as red, green and blue (RGB). Ostensibly, any failure of specific paints or inks to match this ideal performance is due to the impurity or imperfection of the colorants. In contrast, modern color science does not recognize universal primary colors (no finite combination of colors can produce all other colors) and only uses primary colors to define a given color space. Any three primary colors can mix only a limited range of colors, called a gamut, which is always smaller (contains fewer colors) than the full range of colors humans can perceive.