At least when it comes to food coloring labeled as natural, many of these products are also considered vegan, because they're made from plants. But there's a big catch.

Responses noted that natural and/or plant-based food-coloring sets are available ... with the latter supported by long-standing evidence of dyes such as Red No. 3 being carcinogenic to lab animals.

FDA debates ban on Red Dye No. 3 amid cancer concerns 04:37. The Food and Drug Administration announced Wednesday it had decided to revoke Red 3's authorization to be added to foods, over concerns ...