Abstract: Azopyrazolium dyes of the formula: ##STR1## in which R.sub.1 represents an alkyl group or a phenyl group which may be substituted with a halogen atom or with a nitro, alkoxy or alkyl group; R.sub.2 represents an alkyl group; R.sub.3 represents an atom of hydrogen or halogen; R.sub.4 represents the residue of a coupler R.sub.4 H free of a sulfonic or carboxylic group; and X.sup.- represents a monovalent anion, and 3-trifluoromethyl-4-aryl-5-amino pyrazoles of the formula ##STR2## in which R.sub.3 and R.sub.4 have the same meanings as above and R'.sub.1 represents a hydrogen atom, an alkyl group, or a phenyl group which may be substituted with a halogen atom or with a nitro, alkoxy or alkyl group, are disclosed; methods are disclosed for making these compounds and using them, e.g., for using the pyrazoles to form the dyes.

Abstract: New cationic pyrazole dyestuffs are disclosed represented by the general formula: ##STR1## wherein one of the symbols R.sub.1 and R.sub.3 represents an alkyl group and the other a phenyl, chlorophenyl or methoxyphenyl group; R.sub.2 represents an alkyl group; R.sub.4 represents a hydrogen atom or an alkyl, hydroxyalkyl, halogenoalkyl, alkoxyalkyl or acylaminoalkyl group; X represents a hydrogen or chlorine atom; Y represents a hydrogen or halogen atom or a methyl, alkoxy or acetylamino group; and A.sup.- represents a monovalent anion. These pyrazole dyestuffs can be used for dyeing or printing of fibers based on polymers or copolymers of acrylonitrile and fibers based on polyamides or polyesters modified by acid groups.

Abstract: Azopyrazolium dyes of the formula: ##STR1## in which R.sub.1 represents an alkyl group or a phenyl group which may be substituted with a halogen atom or with a nitro, alkoxy or alkyl group, R.sub.2 represents an alkyl group; R.sub.3 represents an atom of hydrogen or halogen; R.sub.4 represents the residue of a coupler R.sub.4 H free of a sulfonic or carboxylic group; and X.sup.- represents a monovalent anion, and 3-trifluoromethyl-4-aryl-5-amino pyrazoles of the formula in which R.sub.3 and R.sub.4 have the same meanings as above and R'.sub.1 represents a hydrogen atom, an alkyl group, or a phenyl group which may be substituted with a halogen atom or with a nitro, alkoxy or alkyl group, are disclosed; methods are disclosed for making these compounds and using them for the dyeing of fibers based on polymers and copolymers of acrylonitrile or on acid-modified polyesters or polyamides to pure and brilliant shades having good fastness, especially fastness to light, e.g., for using the pyrazoles to form the dyes.

Abstract: Dyestuffs of the formula: ##SPC1##In which R.sub.1 represents a hydrogen atom or an alkyl or aryl group, R.sub.2 represents an alkyl group, R.sub.3 represents an aryl group when R.sub.1 is an alkyl group and an alkyl group when R.sub.1 is a hydrogen atom or an aryl group, R.sub.4 represents a hydrogen atom or an alkyl group, R.sub.5 represents an alkyl, hydroxyalkyl, cyanalkyl, acylaminoalkyl or alkanedioyliminoalkyl group, Y represents a hydrogen atom or an alkyl, alkoxy or acylamino group, Z represents a hydrogen atom or an alkoxy group and X represents a monovalent anion; process for the preparation of such dyestuffs which comprises treating a dyestuff of the formula: ##SPC2##In which R.sub.1, R.sub.4, R.sub.5, Y and Z have the same significance as above, R'.sub.3 represents a hydrogen atom if R.sub.1 is a hydrogen atom or an aryl group and R'.sub.3 represents an aryl atom if R.sub.