The red impurity in trypan blue.
D001391:Azo Compounds / Q000032:analysis*; D001713:Biphenyl Compounds / Q000032:analysis*; D002852:Chromatography, Ion Exchange; D004586:Electrophoresis; D009281:Naphthalenes / Q000032:analysis*; D013451:Sulfonic Acids / Q000032:analysis*; D014343:Trypan Blue / Q000032:analysis*
D001391:Azo Compounds; D001713:Biphenyl Compounds; D009281:Naphthalenes; D013451:Sulfonic Acids; D014343:Trypan Blue