Cationic diaza cyanine dyes

摘要

Cationic diazacyanine dyestuffs of the formula IMAGE (I) and their mixtures with the isomeric dyestuffs of the formula IMAGE (II) wherein R represents methyl or ethyl and X- represents a colorless anion, are suitable for dyeing polyacrylonitrile and, in particular, polyacrylonitrile-wool mixtures.