Posted: Aug 11, 2017 1:37 pm
by DavidMcC
GrahamH wrote:...

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

Can you post an example of the "green skies" and rainbows without blue?
Maybe there is colour distortion in old paintings, due to pigment-bleaching in sunlight, though that is more likely to fade the reds and retain blue in my experience.