Synonyms: ACID BLUE 110;sodium 2-[[4-[(4-amino-3-methyl-phenyl)-(4-anilinophenyl)methylidene]-1-cyclohexa-2,5-dienylidene]amino]benzenesulfonate;ALKALI BLUE 4B;ALKALI BLUE 4 B, FOR MICROSCOPY;sodium [[4-[(4-amino-m-tolyl)[4-(phenylimino)cyclohexa-2,5-dien-1-ylidene]methyl]phenyl]amino]benzenesulphonate;CI 42750;AlkaliBlue5BC.I.42750;AlkaliBlue6BC.I.42765;ALKALI BLUE 6 B SOLUTION, ACID-BASE INDI CATOR;