1-Naphthalenesulfonic acid, 3-hydroxy-4-(2-hydroxy-1-naphthylazo)-, sodium salt 1-Naphthalenesulfonic acid, 3-hydroxy-4-[(2-hydroxy-1-naphthalenyl)azo]-, monosodium salt 2,2'-Oxy-4-sulfononaphthaleneazonaphthalene 2538-85-4 3-Hydroxy-4-(2-hydroxy-1-naphthylazo)-1-naphthalenesulfonic acid, sodium salt Acid Chrome Blue Acid Chrome Blue Black Acid Chrome Dark Blue ERN Alizarine Blue Black R Alizarine Blue OCR Alizarine Blue OCRA Alizarine Blue OCRB Alizarine Blue OCRN Alizarine Blue OS Alizarine Chrome Black 6B Anthranol Chrome Blue Black RBA Anthranol Chrome Blue Black RZF Atlantichrome Blue Black RZN Azochromol Blue Black R C.I. 15705 C.I. Mordant Black 17 C.I. Mordant Black 17, monosodium salt Calcochrome Blue Black R Calcon Chromazine Blue Black R Chrome Acid Blue Chrome Black 6B Chrome Blue Black