Secondary color
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A secondary color is a color made by mixing two primary colors of a given color model in even proportions. Combining one secondary color and a primary color in the same manner produces a tertiary colo
Page from A New Practical Treatise on the Three Primitive Colours Assumed as a Perfect System of Rudimentary Information by Charles Hayter.
Color theory
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Color theory, or more specifically traditional color theory, is a historical body of knowledge describing the behavior of colors — namely in color mixing, color contrast effects, color harmony, color
Secondary color
…in even proportions. Combining one secondary color and a primary color in the same manner produces a tertiary color. Secondary colors are special in traditional color theory and color science. In traditional color theory, it is believed that all colors can be mixed from three universal primary - or pure - colors, which were…
Johann Wolfgang von Goethe's color wheel from his 1810 Theory of Colours
Georg Christoph Lichtenberg. Göttingen, 1775, plate III.
Ignaz Schiffermüller, Versuch eines Farbensystems (Vienna, 1772), plate I.