4 / 0: Full Color Front. Blank back.
4 / 1: Full Color Front. Black & White back.
4 / 4: Full Color Front. Full Color Back.
The mixture of ideal CMYK colors is subtractive (cyan, magenta, and yellow printed together on white result in black). CMYK works through light absorption. The colors that are seen are from the part of light that is not absorbed. In CMYK, magenta plus yellow produces red, magenta plus cyan makes blue and cyan plus yellow generates green.
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