Use of the 1:2 chromium complex of 1-amino-2-(3', 5'-dinitro-2'-hydroxyphenylazo)-4-sulfonaphthalene and alkali metal salts thereof for dyeing polyamides and oxide layers on aluminum and aluminum alloys

摘要

Disclosed are the 1:2 chromium complex of the formula I and the alkali metal salts thereof which are useful for the coloration of oxide layers produced on aluminum and alloys thereof and for dyeing natural and synthetic polyamides.