Primary colours

The colours yellow, red (magenta), and blue (cyan) from which it is possible to mix all the other colours of the spectrum — also known as the subtractive or colourant primaries. Thus pigments that reflect light of one of these wavelengths and absorb other wavelengths may be mixed to produce all colours. Also, the light (-source) primaries: Lights of red, green, and blue wavelengths may be mixed to produce all colours. Light primaries are used in theatrical stage lighting, and in colour video and computer screens. (Artlex.com)

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