Bayer Aktiengesellschaft

Hans-Lothar Dorsch

Roderich Raue

Karl H Hermann

Dietmar Kalz

Volker Huhne

Karl-Heinz Hermann

Cationic hydrazone dyestuffs of the general formula ##STR1## in which R.sub.1 stands for hydrogen, C.sub.1 -C.sub.4 -alkyl, C.sub.1 - to C.sub.4 -alkoxy, nitro or halogen,

Process for preparing cationic hydrazone dyestuffs

Cationic dyestuffs of the formula ##STR1## wherein R.sub.1 represents a lower alkyl, alkenyl or hydroxyalkyl radical,

Thiazolediazacyanine dyestuffs

Process for isolating dyestuffs of the formula ##STR1## wherein R.sub.1 -R.sub.12 denote hydrogen, alkyl, halogenoalkyl, halogen, alkoxy, alkylmercapto, alkylsulphonyl, alkoxysulphonyl, alkylcarbonyl, alkoxycarbonyl, nitro or cyano, X and Y denote ##STR2## and R.sub.13 and R.sub.14 denote hydrogen, alkyl, halogenoalkyl, cyanoalkyl, cycloalkyl, aryl or aralkyl, and wherein

Process for isolating triarylmethane dyestuffs

Dyestuffs of the formula ##STR1## wherein R.sub.1 -R.sub.2 denote hydrogen, alkyl, halogenoalkyl, halogen, alkoxy, alkylmercapto, alkylsulfphonyl, alkoxysulphonyl, alkylcarbonyl, alkoxycarbonyl, nitro or cyano,

Dyestuffs of the formula ##STR1## WHEREIN A denotes a ring which contains at least one quaternary nitrogen atom;

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Hans-Lothar Dorsch