Oxidative dye compositions containing a 2,5-dihydroxyphenylalkanoic acid or salts thereof as antioxidant

A composition suitable for dyeing human hair, consisting essentially of at least one oxidative dyestuff and, as anti-oxidant, a 2,5-dihydroxyphenylalkanoic acid or a salt thereof corresponding to the general formula:

• ##STR22## in which R.sub.1 and R.sub.2 are identical or different and denote hydrogen or a straight- or branched-chain alkyl group of 1 to 4 carbon atoms, X denotes hydrogen, an alkali metal, ammonium, or an alkanolamine radical and n is an integer from 1 to 4.