Says anyone familiar with Ancient Greek, and also anyone who has followed linguistics (even in pop-sci form like Deutscher’s Through the Language Glass) recently. The comment by fsckboy, which was already there when you commented, gets it. For the Greeks, the connotation of wine was different than purple, purple was not a basic color term in that stage of the language, and πορφυρός was used only in the context of purple clothing and the dye used to make it.