- Synonyms: Helianthine, 4- Dimethylaminoazobenzene-4'-sulfonic acid sodium salt, Gold oranger- C14H14N3NaO3Sr- CAS [547-58-0]r- EINECS-No.: 208-925-3r- Density: ~ 1,0 g/cm3 r- Tariff number: 2927 00 00 90r- Applications: analytical chemistry, laboratory reagent, indicator, for biology.rrSPECIFICATIONSrpH range (red-orange): 3,1 - 4,4 rr