3-Trifluoromethyl-4-phenyl-pyrazolium azo dyestuffs

A dyestuff of the formula:

• ##STR11## in which R.sub.1 is alkyl containing 1 to 4 carbon atoms, phenyl, chlorophenyl, bromophenyl, nitrophenyl, alkoxy (C.sub.1 -C.sub.2)-phenyl or alkyl (C.sub.1 -C.sub.4)-phenyl;
• R.sub.2 is alkyl containing 1 to 4 carbon atoms;
• R.sub.3 is hydrogen, chlorine or bromine;
• R.sub.4 is 4-diemethylamino-phenyl,
• 4-diethylamino-2-methyl-phenyl,
• 4-diethylamino-2-methoxy-phenyl,
• 4-(N-ethyl-N-cyanoethylamino)-phenyl,
• 2-acetylamino-4-diethylamino-phenyl,
• 2,5-diethoxy-4-diethylamino-phenyl,
• 2,5-dimethyl-4-dimethylamino-phenyl,
• 4-[N-2-diethylaminoethyl)-N-ethylamino]-2-methyl-phenyl,
• 2-methyl-4-(N-trifluoroethyl-N-ethylamino)-phenyl,
• 2-methyl-4-(N-ethyl-N-succinimidoethylamino)-phenyl,
• 2-chloro-4-diethylamino-phenyl,
• 4-(N-ethyl-N-cyanoethylamino)-2-methyl-phenyl,
• 4-morpholino-phenyl,
• 4-(N-methyl-N-phenylamino)-phenyl,
• 4-(4-methoxy-anilino)-1-naphtyl,
• 3-indolyl,
• 2-methyl-3-indolyl,
• 2-phenyl-3-indolyl,
• 1-methyl-2-phenyl-3-indolyl,
• 1-ethyl-2-methyl-3-indolyl,
• 1-cyanoethyl-2-methyl-3-indolyl,
• 1-cyanoethyl-2-phenyl-3-indolyl,
• 2-isopropyl-3-indolyl,
• 1-(2-hydroxypropyl)-2-phenyl-3-indolyl,
• 3-methyl-5-hydroxy-4-pyrazolyl,
• 1-phenyl-3-methyl-5-hydroxy-4-pyrazolyl,
• 1-p-tolyl-3-methyl-5-hydroxy-4-pyrazolyl,
• 1-m-nitrophenyl-3-methyl-5-hydroxy-4-pyrazolyl,
• 1-p-chlorophenyl-3-methyl-5-hydroxy-4-pyrazolyl, or
• 1-p-methoxyphenyl-3-methyl-5-hydroxy-4-pyrazolyl,
• and X.sup..crclbar. is a monovalent anion.