Posted: Aug 11, 2017 9:24 am
by GrahamH
This is curious. I know that what we see as orange was considered red:
Before the late 15th century, the colour orange existed in Europe, but without the name; it was simply called yellow-red. Portuguese merchants brought the first orange trees to Europe from Asia in the late 15th and early 16th century, along with the Sanskrit naranga, which gradually became part of several European languages: "naranja" in Spanish, and "orange" in English.

The depiction of rainbows without blue, even on paintings with blue skies, seems very strange. Skies shown as green is also very odd.