Patent ID: 7909892

Claim:
An aqueous dye solution, comprising a) 5 to 30% by weight of a dye of formula (1) in which K is a residue of a coupling component of the acetoacetanilide, pyridone, pyrazolone or pyrimidine series and M is hydrogen, an alkali metal or alkaline earth metal, ammonium or alkylammonium, b) 0.05 to 5% by weight of one or more compounds of formula (2) in which A represents —NR 1 R 2 , —NHCOR 1 , —CN, halogen, —NO 2 , —OH, —OR 1 , hydrogen, C 1 -C 4 alkyl, C 2 -C 4 alkenyl, C 2 -C 4 alkinyl, —CO 2 M, —CO 2 R 1 R 2 , or —CONR 1 , R 2 , wherein M is as previously defined, and R 1 and R 2 each, independently of one another, represent hydrogen or C 1 -C 4 alkyl provided that A is not represented by —NH 2 , or A is a residue of formula (3) X represents O, S or NR 1 , R 1 being as previously defined; Y represents N or CR 1 , R 1 being as previously defined and P, Q and R each, independently of one another, represent hydrogen, C 1 -C 4 alkyl, —SO 3 M, —PO 3 M, —CO 2 M, —OH, —NO 2 or —COR 1 , M and R 1 being as previously defined, c) an organic or an inorganic base or mixtures thereof, d) optionally, further additives and e) water.