Einecs 228-910-5;C. I. Pigment Red 54;Pigment red 54 (C.I. 14830:1);Calcium bis[5-hydroxy-6-(naphthylazo)naphthalenesulfonate];calcium bis[5-hydroxy-6-(naphthylazo)naphthalenesulphonate];1-Naphthalenesulfonic acid, 5-hydroxy-6-(1-naphthalenylazo)-, calcium salt (2:1);1-Naphthalenesulfonic acid, 5-hydroxy-6-(2-(1-naphthalenyl)diazenyl)-, calcium salt (2:1)