Sunset Yellow FCF (also known as Orange Yellow S, or C.I. 15985) is a petroleum-derived orange azo dye with a pH dependent maximum absorption at about 480 nm at pH 1 and 443 nm at pH 13 with a shoulder at 500 nm. When added to foods sold in the US it is known as FD&C Yellow 6; when sold in Europe, it is denoted by E Number E110.

Uses
Sunset Yellow is used in food, cosmetics, and drugs. For example, it is used in candy, desserts, snacks, sauces, and preserved fruits. Sunset Yellow is often used in conjunction with E123, amaranth, to produce a brown colouring in both chocolates and caramel.