Achromatic

Possessing no color or hue, or, in other words absorbing or reflecting all wavelengths of light in equal amounts. The term also describes a printed material that contains only black, white, and/or gray, the achromatic colors. In subtractive color theory, a white pigment reflects all the light that hits it, absorbing no colors, while black pigments absorb all the light that strikes it, reflecting no light back to the observer. Between these extremes are the grays, which can be produced either by mixing white and black, or by mixing complementary colors. (Light itself, by the way, cannot actually be gray.) Achromatic colors are also known as neutral colors.

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