CMYK color model - Wikipedia

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Color model - Wikipedia

Why do some products have CMYK dots printed on some packaging? - Quora

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CMYK color model - Simple English Wikipedia, the free encyclopedia

Advanced Color Theory: Color Wheels, Impossible Colors, & the Primary Color Debate

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CMYK Definition - What is the CMYK color model?

CMYK color model - Wikipedia

Secondary color - Wikipedia

File:RGB color model.svg - Wikimedia Commons