Abstract: Hair coloring compositions comprise a preformed organic peroxyacid oxidizing agent selected from the group consisting of (i) a compound of the formula ##STR1## wherein X is a substituted or unsubstituted C.sub.12 alkyl group, and (ii) a compound of the formula ##STR2## wherein R.sup.1 is selected from the group consisting of alkyl, aryl and alkaryl groups with from 1 to 14 carbon atoms, R.sup.2 is selected from the group consisting of alkylene, arylene and alkarylene groups containing from 1 to 14 carbon atoms, and R.sup.5 is selected from the group consisting of H, alkyl, aryl and alkaryl groups containing 1 to 10 carbon atoms; and at least one oxidative hair coloring agent. The compositions are suitable for coloring human or animal hair and may be provided in a hair coloring kit comprising a single package including two separate bottles.

Abstract: Hair coloring compositions comprise (a) a water-soluble peroxygen oxidizing agent, (b) an organic peroxyacid precursor oxidizing aid, and (c) one or more oxidative hair coloring agents. The compositions may be used in processes for coloring human or animal hair and may be conveniently provided in kits wherein each of the aforementioned components are individually packaged.