Wow, what a terrible misunderstanding of colour. Competing explanations that make as much sense and avoid the need for retarded ideas around recent evolution: The reason old paintings lack certain pigments is entirely practical i.e availability and or price. Such practical reasons occasionally crystallize into art traditions, even when no longer applicable. The reason old languages rarely used names for colours is be…
I don’t think the fact that you can be trained to differentiate a color means you were actively responding to that differentiation prior to being incentivized & systematically exposed to the difference.
Not arguing with your overall point, but that experiment is a weak supporting argument. (Although a strong test for what nuances we can learn to perceive quickly.)