ANIONIC AZO DYES AND THE METAL COMPLEXES THEREOF FOR COLOURING LEATHER

摘要

The invention relates to the use of anionic dyes with at least one acid group in the form of the salt thereof and at least 2 azo groups, containing lithium ions and sodium ions in the mole ratio of from 1:19 to 4:1, for the colouring of leather.