Patent ID: 6927284

Claim:
A 1:2-metal complex dye of the formula wherein R 1 is H, —NO 2 , —SO 3 M or —NH(C 1-2 -alkyl), R 2 is H, substituted C 1-4 -alkyl, unsubstituted C 1-4 -alkyl, —NO 2 , or —OH, R 3 is H, substituted C 1-4 -alkyl, unsubstituted C 1-4 alkyl, —NO 2 , or —OH, R′ 1 is H, —NO 2 , —SO 3 M or —NH(C 1-2 -alkyl), R′ 2 is H, substituted C 1-4 -alkyl, unsubstituted C 1-4 -alkyl, —NO 2 or —OH, R′ 3 is H, substituted C 1-4 -alkyl, unsubstituted C 1-4 -alkyl, —NO 2 , or —OH, Y is —OM or —NR 4 R 5 , Z is —OM or —NR 4 ′R 5 ′, R 4 is H, C 1-4 -alkyl, a substituted aromatic ring or an unsubstituted aromatic ring, R 4 ′ is H, C 1-4 -alkyl, a substituted aromatic ring or an unsubstituted aromatic ring, R 5 is H, C 1-4 -alkyl, a substituted aromatic ring or an unsubstituted aromatic ring, R 5 ′ is H, C 1-4 -alkyl, a substituted aromatic ring or an unsubstituted aromatic ring, n is 0 or 1, n′ is 0 or 1, M is hydrogen or a cation, (Kat) + is a counter-ion and Me is a complex-forming metal, with the proviso that if Y and Z signify both NH 2 , Me is not Cr.