Why do printers have CMYK ink instead of RYB & black ink?
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White light which comes from the sun contains the full spectrum which can be reproduced by 3 colors of light added together – red, blue, & green. Any color of light can be produced from these 3 colors of light added together. White is all 3 of them. Black is none of them. These 3 colors are used in producing colors of light such as in a TV or movie. This is the additive process. Colors in printing and painting are produced by combining one or more of the 3 primary pigments – cyan, magenta, & yellow. Cyan reflects blue and green light. Magenta reflects red and blue light. Yellow reflects red and green light. Any color of ink or paint can be produced with a correct combination of these 3 pigment colors. This is the subtractive process. To get the best color black is also usually present because it makes for better contrast.
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