Process for dyeing amide-containing fibre materials

摘要

The partly known blue dyestuffs of the formula wherein R1 denotes hydrogen, alkyl, aralkyl, alkenyl, cycloalkyl or aryl, R2 denotes hydrogen or alkyl, Me(+) denotes a cation and n denotes 1 or 2, are highly suitable for the trichromatic dyeing of polyamide fibre materials, producing level dyeings thereon with a good standard of fastness.