Why do printers have CMYK ink instead of RYB & black ink?
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This might be slightly oversimplified but nobody has really eli5ed it yet.
The paper starts white and gets darker from there with the ink. Red green and blue are darker colors than cyan magenta and yellow. When you add R G or B ink together you can only go darker and you wouldn’t be able to create the colors that are lighter than those three.
If you start off with lighter colors you can still make your way to the darker colors.
You can simulate the way all of this works by opening your favorite image editing software that has blending modes. Make a set of three circles, set the blend mode to multiply on each layer and overlap them and see what happens. You can try it for both RGB and CMY.
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