> The purple colour we see is formed from a mixture of red and blue, whether it's something in nature, screen displaying or printing. Well if it’s on an RGB sc

> The purple colour we see is formed from a mixture of red and blue, whether it's something in nature, screen displaying or printing. Well if it’s on an RGB screen, or printed with CMYK inks then it’s not ‘real’ violet, but there must be plenty of natural and artificial pigments that are actually reflecting violet light and not blue + red light. I imagine any pure compound would be doing this. E.g cobalt phosphate (aka cobalt violet). You could tell by illuminating a sample with different light sources. See metameric failure: https://en.wikipedia.org/wiki/Metamerism_(color)#Metameric_failure https://en.wikipedia.org/wiki/Metamerism_(color)#Metameric_f...