FD&C Red 40 in Skin Care Guide

Allura Red AC is a red azo dye that goes by several names including: Allura Red, Food Red 17, C.I. 16035, FD&C Red 40 [1][2], 2-naphthalenesulfonic acid, 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-, disodium salt, and disodium 6-hydroxy-5-((2-methoxy-5-methyl-4-sulfophenyl)azo)-2-naphthalene-sulfonate. It is used as a food dye and has the E number E129. Allura Red AC was originally introduced in the United States as a replacement for the use of amaranth as a food coloring.[citation needed]

It has the appearance of a dark red powder. It usually comes as a sodium salt but can also be used as both calcium and potassium salts. It is soluble in water. In water solution, its maximum absorbance lies at about 504 nm. Its melting point is at >300 degrees Celsius.

Allura Red AC is one of many High Production Volume Chemicals.

Red AC was originally manufactured from coal tar but is now mostly made from petroleum. Despite the popular misconception, Allura Red AC is not derived from any insect, unlike the food colouring carmine which is derived from the female cochineal insect.

Related dyes include Sunset Yellow FCF, Scarlet GN, tartrazine, and Orange B....