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 United States 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 foods, cosmetics, and drugs. Sunset Yellow FCF is used as an orange or yellow-orange dye 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 coloring in both chocolates and caramel.

E number: E110 (colors)
Chemical formula: C16H10N2Na2O7S2
CAS Number: 2783-94-0