In colorimetry, the Munsell color system is a color space that specifies colors based on three color dimensions: hue, value (lightness), and chroma (color purity). It was created by Professor Albert H. Munsell in the first decade of the 20th century and adopted by the USDA as the official color system for soil research in the 1930s.
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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