One possible connection is red and yellow pigments called caretenoids, which brighten body parts and strengthen the immune response. (sciencemag.org)
According to Annie Sloan, this clean yellow first appeared with the development of chrome yellow pigment in the 1700 ′ s. (searosecottage.com)
While it is known that red and yellow pigments found in bright fruit and vegetables increase skin yellowness, recent studies have shown that «carotenoid coloration is a more important factor in healthy appearance than melanin coloration,» clarify the academics. (sciencedaily.com)