Ponceau 3R

Ponceau 3R (C.I. 16155) is an azo dye that once was used as a red food colorant. It is one of a family of Ponceau (French for 'poppy-colored') dyes. Ponceau 3R (C.I. 16155) is an azo dye that once was used as a red food colorant. It is one of a family of Ponceau (French for 'poppy-colored') dyes.