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primary colour

Also called additive primary. any of three spectral colours (usually red, green, and blue) that can be mixed to match any other colour, including white light but excluding black
Also called subtractive primary. any one of the spectral colours cyan, magenta, or yellow that can be subtracted from white light to match any other colour. An equal mixture of the three produces a black pigment
Also called psychological primary. any one of the colours red, yellow, green, or blue. All other colours look like a mixture of two or more of these colours and they play a unique role in the processing of colour by the visual system
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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  • Red is a primary colour, and green, which is a secondary colour, consists of blue and yellow—the other two primary colours.

    Principles of Decorative Design Christopher Dresser

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