Methanaminium, N-(4-(bis(4-(dimethylamino)phenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-methyl-, 4,4'-bis(2-(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)diazenyl)(1,1'-biphenyl)-2,2'-disulfonate (2:1);((1,1'-Biphenyl)-2,2'-disulfonic acid, 4,4'-bis((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)), compd. with (methanaminium, N-(4-(bis(4-(dimethylamino)phenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-methyl-) (1:2);Methanaminium, N-(4-(bis(4-(dimethylamino)phenyl)methylene)-2,5-cyclohexadien-1-ylidene)-N-methyl-, salt with 4,4'-bis((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)(1,1'-biphenyl)-2,2'-disulfonic acid (2:1);[4-[bis(4-dimethylaminophenyl)methylene]-1-cyclohexa-2,5-dienylidene]-dimethyl-ammonium; 5-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-[4-[(3-methyl-5-oxo-1-phenyl-4H-pyrazol-4-yl)azo]-2-sulfo-phenyl]benzenesulfonic acid