Tone

A quality of a colour, arising from its saturation (purity and impurity), intensity (brilliance and dimness), luminosity (brightness and dullness), and temperature (warm and cool); or to create such a quality in a colour. To tone down is to make a colour less vivid, harsh, or violent; moderate. To tone up is to make one become brighter or more vigorous. Tonality can refer to the general effect in painting of light, colour, and shade, or the relative range of these qualities in colour schemes. (Artlex.com)

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