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Red No.503
| Legal color: | Red No.504 | | General name: | Ponceau SX | | Class: | Acid Dye | | FDA : | FD & C Red No.4 | | CI #: | C.I. 14700 | | Color #: | Food Red 1 | | CAS #: | 4548-53-2 | | CAS : | ：1-Naphthalenesulfonic acid,3-[(2,4-dimethyl-5-sulfophenyl)azo]-4-hydroxy-,disodium salt | | IUPAC: | →1;Disodium 4-hydroxy-3-(2,4-dimethyl-5-sulfonatophenylazo)-1-
naphthalenesulfonate
→2;4-Hydroxy-3-(2,4-dimethyl-5-sulfophenylazo)-1-
naphthalenesulfonic acid disodium salt |
| Chemical structure : |  
Ponceau SX |
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