Gemisch aus 1,1'-((Dihydroxyphenylen)bis(azo-3,1-phenylenazo(1-(3-(dimethylamino)propyl)-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridin-5,3-diyl)))dipyridiniumdichlorid, dihydrochlorid, Isomerengemisch und 1-(1-(3-Dimethylaminopropyl)-5-(3-((4-(1-(3-dimethylaminopropyl)-1,6-dihydro-2-hydroxy-4-methyl-6-oxo-5-pyridinio-3-pyridylazo)phenylazo)-2,4(oder 2,6 oder 3,5)-dihydroxyphenylazo)phenylazo)-1,2-dihydro-6-hydroxy-4-methyl-2-oxo-3-pyridyl)pyridiniumdichlorid