Red dye 40 is a synthetic preservative used to color food products red. It’s also known as Allura Red AC, or C18H14N2Na2O8S2, if you go by molecular formulas. Like most food dyes, Red 40 was ...

Red 40, also known as Allura Red AC, is a synthetic dye prevalent in numerous food products. It is especially common in items such as candies, cereals, and beverages where a vibrant red color is ...