Comment by adrian_b

There is no doubt that confusions are the origin of these English words.

It is extremely unlikely that any of those who introduced these words in English chose intentionally to use them for other things than for what they had been used for millennia.

For a modern user, it is no longer a confusion to use such words in their currently widespread sense. When speaking to others, I also use such words with their current meaning, in order to be understood.

Nevertheless, it is good to know their original meanings, especially when reading older texts, which may use those meanings. I have seen a lot of ridiculous claims about texts written in the Antiquity, or even about some texts written a couple of centuries ago, where those who had read those texts had been mislead by believing that the words had the same meaning as in modern English.

Especially about the colors known by ancient people, e.g about the Ancient Greeks, there have been many fantastic theories, e.g. that the Ancient Greeks did not know blue or brown, when already in the Iliad of Homer there are a lot of instances of words meaning "blue" (= "the color of the ultramarine blue pigment") or "brown" (= "the color of burnt wood").