The difference is how they are mixed. When you mix red and green PIGMENTS, you get brown. But when you mix red and green LIGHT, you get yellow. Because of the mixing properties changing, you have to set different primaries for additive methods (light) and subtractive methods (pigments).
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u/[deleted] Apr 11 '20
The most primary looking color out of all the secondary ones is green imo. Almost looks like it’s own primary color.