Also, the people most likely to discuss colors are artists and such. The thing with blue is that for a very long time pure blue pigments like aquamarine were ex

Also, the people most likely to discuss colors are artists and such. The thing with blue is that for a very long time pure blue pigments like aquamarine were extremely rare and expensive, quite likely non-existent at all in the times of basic vocabulary formation and associated development. You don't give names and fine distinctions to things you don't deal with often.