Secondary (subtractive) colors

In the subtractive color process cyan, magenta and yellow are the primary colors. We begin with white. Cyan removes just the red. Yellow removes just the blue. Magenta removes just the green. Cyan and yellow together remove both the red and the blue, leaving green.

The rules of subtractive color mixing are ...

yellow + cyan = green

cyan + magenta = blue

magenta + yellow = red

cyan + magenta + yellow = black

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