Composition for treating keratinous fibers

A kit composition for treating keratinous fibers, which comprises a first agent separate from a second agent, said first agent containing an ion of a metal selected from the group consisting of magnesium, calcium, zinc, silver, aluminum, barium, manganese, iron, nickel and mixtures thereof, and

• wherein said metal ion is contained in said first agent in an amount of from 0.05 to 20.0% by weight, and said second agent comprising:
• (B-1) A first organic or inorganic compound or mixtures thereof that is capable of permeating into the keratinous fibers and which forms a water-insoluble or sparingly soluble complex with said metal ion of said first agent, wherein said component (B-1) is contained in said second agent in an amount of from 0.1 to 10.0% by weight based on the total weight of said second agent, and wherein said first organic compound is selected from the group consisting of formic acid, acetic acid, propionic acid, butyric acid, isobutyric acid, valeric acid, isovaleric acid, sorbic acid, lactic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, and salts thereof, and wherein said first inorganic compound is a source of an ion selected from the group consisting of chloride ion, hydroxide ion, nitrite ion, sulfate ion, phosphate ion, borate ion, and carbonate ion, and
• (B-2) A second organic compound that cannot permeate into the keratinous fibers and which forms a water-soluble complex with said metal ion of said first agent, wherein said component (B-2) is contained in said second agent in an amount of from 0.01 to 20.0% by weight based on the total weight of said second agent, and wherein said second organic compound is selected from the group consisting of a polycarbonic acid, oxycarbonic acid, amino-polycarbonic acid, polyphosphonic acid and mixtures thereof.