Water soluble granules.Ponceau 4R also known as C.I. 16255,1 Cochineal Red A,1 C.I. Acid Red 18,1 Brilliant Scarlet 3R,1 Brilliant Scarlet 4Rneeded is a synthetic colourant that may be used as a food colouring. pse note that we recommend this is not ingested but rather only used as a cosmetic colouring. It is denoted by E Number E124.1 Its chemical name is 14sulpho1napthylazo 2napthol 6,8disulphonic acid, trisodium salt. Ponceau is French for poppy-coloured is the generic name for a family of azo dyes.