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CMYK is more intuitive than RGB but still not quite there. It is difficult to grasp that mixing a saturated pinkish color (magenta) with yellow will produce red. On top of that, if you add blue (cyan) it will produce black!

Printer cartridges are highly calibrated for this kind of mixing, if you attempt to do it with acrylics or oils you will get a dirty dark grayish color. This is because different inks have different opacity and reflect light in different ways (as the German research points out).

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