20 Things You Didn't Know About ... Color
The human eye actually sees only three colors, scientists refer to color in terms of wavelength, and coloring foods goes back at least 3,500 years.
By Sylvia Morrow|Friday, October 06, 2017
1. For centuries, academics thought colored light was modified white, or “pure,†light. (We’ll get back to how wrong they were in a bit.)
2. And color sometimes is a modifier. For example, coloring foods goes back at least 3,500 years, when ancient Egyptians added wine and other colorants to candy to increase its visual appeal.
http://discovermagazine.com/2017/nov/20-things-you-didnt-know-about--color
