I think I have a food intolerance (not the same as an allergy) to FD&C Red #40 food coloring (in large amounts). I've been drinking a lot of Kool-Aid^TM (and also the Canadian-made Great Values [Wal-Mart brand] generic flavored, powdered beverage) lately, and I think I overdid it because I got a case of hives, and between examining the ingredient labels and a few minutes of research on the web, I'm convinced that red food coloring in large amounts can trigger reactions such as hives. Well, let me say it this way - food colorings are safe for most people (and even in small amounts for those with food intolerances), but some people do develop reactions to them in large amounts.   =(