How to process the keratin fibers

The present invention provides a method of treating the keratin fibers, Onto the keratin fibers, comprising the steps of applying a composition comprising at least one amino acid except cysteine, basic arginine and basic lysine, Then, placing the keratin fibers in the closed space, Then, and a step of heating the keratin fibers, The composition, also a reducing agent, wherein: (In the formula, X Also carbonate ion source does not contain, to a method. The present invention further relates to the compositions themselves and kits for use in the method described above.