2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[[2-sulfo-4-[(4-sulfophenyl)azo]phenyl]azo]-, tetrasodium salt 2-Hydroxy-1-[[4[(4-sulfophenyl)azo]-2-sulfophenyl]azo]naphthalene-3,6-disulfonic acid, tetrasodium salt 6226-79-5 C.I. 27195 C.I. Acid Red 112 C.I. Acid Red 112, tetrasodium salt NSC16216 Ponceau Red S Ponceau S Ponceau S Extra