Pink/magenta comes from stimulating S (blue) and L (red) receptors simultaneously while not stimulating M (green). It's actually rather unique in that respect.

Pink/magenta comes from stimulating S (blue) and L (red) receptors simultaneously while not stimulating M (green). It's actually rather unique in that respect. It's the "glue" your brain uses to paste the red and blue ends of the spectrum together, because the visible electromagnetic spectrum has two edges (blue and red, high and low frequency respectively) while the perception of hue does not (see: color wheel). The only color you won't find on a rainbow, so to speak. If you say "I can make magenta by mixing white and red light," I'll come back and say "OK, what do you call the color you get when you subsequently filter out green?"