Use of copper complexes of disazo dyes for dyeing natural and synthetic material

摘要

Use of the mono-copper complex of a dye of formula (1) wherein Z₁, Z₂, R₁, R₂, R₃, R₄, X, n and m are as defined in the claims, and mixtures thereof with the bis-copper complex of such a dye, for dyeing natural and synthetic material.