> Egypt, Mesopotamia and the medieval Islamic cultures survived especially well in their extremely dry climates. And they had no violet in them at all. In ancient times purple was a luxury for dying clothes, even in medieval times, and harvesting sea snails for the dye was lucrative business between egyptians, phoeniceans etc. so how come they claim we can't see it? I dont think their claim is true. What's next? "Why…
Consider the color orange. There wasn't a name for the color in antiquity. When the fruit become available, its color was referred to as "the color of a norange" (this happened independently in various European languages. Unrelated factoid, many languages with an indefinite article that ends with n, assimilated the leading n of the fruit name in the article). Clearly our ancestors could see the orange colored before…
I think the whole naming of "orange" had to do with the fact that the need arose to actually discriminate the fruit you wanted by its color