Food manufacturers have dealt with this limitation of their palettes in an ingenious way: they have kept blue away from “real” foods, and relegated it to the realm of “fun”: candy, kids cereals, and sports drinks. “You can do candy in any color and people will eat it because it is fun,” says Engeseth. “But put that color on somebody’s plate and people don’t typically associate
blue with an edible product. You very rarely see anything blue on a plate.