The invention concerns a method for treating hair keratin fibers to provide them
with new appropriate properties, comprising the following steps: reducing the sulphur
bonds of hair keratin to generate only at the surface of the fibers at a depth
less than 10 m. reactive sites and in fixing covalently on said reactive
sites at least one active compound for providing the hair keratin fibers with new
appropriate properties, said active compound containing at least a reactive function
capable of reacting with said reactive sites formed at the keratin fiber surface.
This method is applicable to the treatment of fibrous or non-fibrous keratin substances
of human or animal origin.
