Thionine blue alkali blue 6 b solution [[4-[Hydroxybis[4-(phenylamino)phenyl]methyl]phenyl]amino]benzenesulfonic acid monosodium salt Acid Blue 119 Alkali Blue 6B Benzenesulfonic acid, [[4-[hydroxybis[4-(phenylamino)phenyl]methyl]phenyl]amino]-, monosodium salt C.I. Acid blue 119 C.I. Acid blue 119, carbinol base, sodium salt