Ponceau 4R (known by more than 100 synonyms,[1]:460–461 including as C.I. 16255,[2] Cochineal Red A,[2] C.I. Acid Red 18,[2] Brilliant Scarlet 3R,[2] Brilliant Scarlet 4R,[2] New Coccine,[1]:460 is a synthetic colourant that may be used as a food colouring. It is denoted by E Number E124.[2] 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.