3209-30-1 C.I. 63340 Disodium 4,4'-((9,10-dihydro-4,8-dihydroxy-9,10-dioxo-1,5-anthrylene)diimino)bis(toluene-3-sulphonate) EINECS 221-718-2 Toluidine blue (anthraquinone dye) m-Toluenesulfonic acid, 6,6'-((4,8-dihydroxy-1,5-anthraquinonylene)diimino)di-, disodium salt