Why are red, yellow, and blue the primary colors of paint if cyan, magenta, and yellow are the subtractive primary colors?
I learned in art class when in grade school that red, yellow, and blue are the primary colors of paint. I also understand that the subtractive primary colors are cyan, magenta, and yellow, because cyan just absorbs red and reflects green and blue, magenta just absorbs green and reflects red and blue, and yellow just absorbs blue and reflects red and blue. From what I understand all pigment groups should have the subtractive primary colors, cyan, magenta, and yellow because when mixing pigments, if either component pigment absorbs a certain wavelength the mixture will too, and only when both component pigments reflect a wavelength will the mixture reflect that wavelength. In paint primary colors yellow is the only primary paint color that I understand to be a subtractive primary color, while red and blue are ones I understand to be additive primary colors.
So why are red, yellow, and blue, as opposed to cyan, magenta, and yellow the primary colors of paint?