METHOD FOR PREPARING AN AGENT FOR DYEING HUMAN HAIR, AND METHOD FOR DYEING HUMAN HAIR USING THE HAIR DYE DERIVED THEREBY

摘要

Oxidation dye compositions particularly useful for dyeing human hair containing as the meta component compounds of the formula: IMAGE or their non-toxic salts, wherein R is alkyl, hydroxyalkyl, phenylalkyl, phenylsulfonyls, alkylsulfonyls or cyanoalkyl.