4-[(2-hydroxy-1-naphthalenyl)azo]-3-methyl-benzenesulfonicacimonosodiums, Orange RO, Acid Orange 8 (C.I.), C.I. Acid Orange 8, sodium 4-(2-hydroxynaphth-1-ylazo)-3-methylbenzenesulphonate, Benzenesulfonicacid,4-[(2-hydroxy-1-naphthalenyl)azo]-3-methyl-,monosodiumsalt, 4-[(2-Hydroxy-1-naphthalenyl)azo]-3-methylbenzenesulfonic acid sodium salt