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All commercial, full-color printing uses CMYK inks. CMYK works almost the complete opposite of RGB. There are three primary colors in this format: cyan, magenta and yellow. With color based on ink, the colors are added together to create black, subtracting from the white on the paper. This is called "Subtractive Color" - you start with white, then subtract light with ink to get black. True Black cannot be achieved with these colors, however. So, black is added - giving you CMYK ("K" is used to refer to black, so it is not confused with the "B" for blue). A fourth color, black, is added for economical and practical reasons, and is referred to by 'K' so as not to be confused with blue. By mixing varying amounts of cyan, magenta, yellow, and black inks, you can create most other colors.

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Q: What is the purpose of using black pigment in color printer?
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