TRUMATCH is based upon the original theories describing color as 3-dimensional space, which were separately presented by Munsell and Ostwald in 1929 and 1931, respectively, and refined in 1931 by the Commission Internationale de l'Eclairage (CIE).
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Primary colors are blue, red and yellow. These are pure colors that have no component other than themselves. Secondary colors are orange, green and purple. These are composed of the primary colors on either side of it on the color wheel. i.e. Orange = red