Patent ID: 7985266

Claim:
A composition for the oxidative dyeing of keratin fibers comprising: a. at least one radical scavenger selected from pyrazol-5-one compounds and tautomeric compounds thereof according to formulas (I), (II), or (III): wherein R 1 comprises substituted alkyl, substituted heteroalkyl, substituted cycloalkyl, substituted heterocycloalkyl, substituted alkenyl, substituted heteroalkenyl, substituted alkynyl, substituted heteroalkynyl, substituted cycloalkenyl, substituted heterocycloalkenyl, substituted cycloalkynyl, substituted heterocycloalkynyl, substituted aryl, substituted heteroaryl, substituted alkaryl, substituted heteroalkaryl, substituted arylkyl, or substituted heteroarylkyl, with one or more substituents comprising CO 2 − , SO 3 − , PO 3 2− , or mixtures thereof; wherein R 2 comprises hydrogen, substituted or unsubstituted alkyl or heteroalkyl, substituted or unsubstituted cycloalkyl or heterocycloalkyl, substituted or unsubstituted alkenyl or heteroalkenyl, substituted or unsubstituted alkynyl or heteroalkynyl, substituted or unsubstituted cycloalkenyl or heterocycloalkenyl, substituted or unsubstituted cycloalkynyl or heterocycloalkynyl, substituted or unsubstituted aryl or heteroaryl, substituted or unsubstituted alkaryl or heteroalkaryl, or substituted or unsubstituted arylkyl or heteroarylkyl; b. at least one chelant; c. at least one coupler compound; and d. at least one developer compound.