According to the trichromatic theory of colour vision, colours are mixed in three opposing pairs: blue or yellow, red or green, and black or white, by specialized cells in the retina and thalamus

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The trichromatic theory of color vision, proposed by Young and Helmholtz, suggests that the eye detects color through the response levels of three types of cones sensitive to different wavelengths of light, not through opposing pairs of colors. The concept of opposing color pairs is part of the opponent-process theory proposed by Hering.

According to the Trichromatic Theory of Colour Vision, Colours Are