Methods, kit and uses for treating hair are provided. A method for treating hair comprises applying to the hair a first composition comprising in a cosmetically acceptable carrier, one or more ionizable linkers of Formula I, or cosmetically acceptable salts thereof, or mixtures thereof:and applying to the hair a second composition comprising in a cosmetically acceptable carrier, one or more ingredients of Formula II, or cosmetically acceptable salts thereof, or mixtures thereof:and wherein the first composition does not comprise any ingredients of Formula II of the second composition. Alternatively, a method for treating hair comprises applying to the hair a composition comprising in a cosmetically acceptable carrier, one or more ionizable linkers of Formula I, or cosmetically acceptable salts thereof, or mixtures thereof； and one or more ingredients of Formula II, or cosmetically acceptable salts thereof, or mixtures thereof.
