FD&C Red No. 4

**Semantic type:** Indicator, Reagent, or Diagnostic Aid|Organic Chemical

**Synonyms:** - 1-Naphthalenesulfonic Acid, 4-Hydroxy-3-((6-Sulfo-2,4-Xylyl)Azo)-, Disodium Salt - C.I. 14700 - Crimson 4R - D&C Red No. 4 - Disodium 3-((2,4-Dimethyl-5-Sulphonatophenyl)Azo)-4-Hydroxynaphthalene-1-Sulphonate - FD&C RED NO. 4 - Maple Ponceau SX - Red No. 1 - Usacert FD & C Red No. 4 - Usacert Red No. 4