Disazo dyes derived from 3,3'-dihalo-5,5'-dichlorobenzidine

摘要

Compounds of the general formula I ##STR1## where R is hydrogen or C. sub.1 -C.sub.6 -alkyl and X is chlorine or bromine, with the proviso that X is only bromine when R is H, possess pigment properties and are distinguished by high color strength, brilliance and very good fastness properties.