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Which colour of light does a cyan pigment absorb?
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The RYB color model is being illustrated on a color wheel.
In the context of optics and subtractive colour mixing, a cyan pigment absorbs red light.1
Subtractive colour mixing occurs when pigments or dyes selectively absorb specific wavelengths of light while reflecting or transmitting others. Because cyan is a subtractive primary colour, it is defined by its ability to absorb red light while transmitting or reflecting the other components of the visible spectrum.1