A method for electrochemically dyeing hair is provided which includes first
applying to the hair an oxidative dye precursor mixture containing a
primary intermediate having a standard Redox potential that is less than
about 1V. This precursor mixture on the hair is then contacted with an
electrode system that has sufficient voltage to electrochemically oxidize
the primary intermediate to produce a colored dye through a coupling
reaction. A system or kit is described for carrying out the method.
