Ponceau 4R (also known as C.I. 16255, Cochineal Red A, C.I. Acid Red 18, Brilliant Scarlet 3R, Brilliant Scarlet 4R, New Coccine), SX purple) is a synthetic colourant that may be used as a food colouring. It is denoted by E Number E124. Its chemical name is 1-(4-sulpho-1-napthylazo)- 2-napthol- 6,8-disulphonic acid, trisodium salt. Ponceau (French for "poppy-coloured") is the generic name for a family of azo dyes.
Ponceau 4R is a red azo dye which can be used in a variety of food products, and is usually synthesized from aromatic hydrocarbons from petroleum.
Read more about Ponceau 4R: Health Effects, Possible Cause of Hyperactivity