Method for the treatment of keratin fibres comprising a pretreatment or post-treatment step

A method for treating keratin fibers comprising:

• a) optionally, applying to the keratin fibers a composition (A) comprising one or more compounds D chosen from organic acids, amino acids, chitosans, vitamins B, vitamin C, vanillin, salts thereof, solvates thereof, or mixtures of two or more thereof, wherein the total amount of compound(s) D ranges from 1% to 20% by weight, relative to the total weight of composition (A);
• b) applying to the keratin fibers a composition (B) comprising:
• i) one or more chemical oxidizing agents chosen from hydrogen peroxide, hydrogen peroxide-generating systems other than peroxygenated salts, or mixtures;
• ii) one or more compounds chosen from carbonates, carbonate-generating systems, bicarbonates, bicarbonate-generating systems, or mixtures of two or more thereof;
• iii) one or more silicates;
• and
• c) optionally, applying to the keratin fibers a composition (C) comprising one or more compounds D chosen from organic acids, amino acids, chitosans, vitamins B, vitamin C, vanillin, salts thereof, solvates thereof, or mixtures of two or more thereof, wherein the total amount of compound(s) D ranges from 1% to 25% by weight, relative to the total weight of composition (C);
• wherein:
• at least one of step a) or step c) is present;
• when step a) is present, step a) is carried out before step b);
• when step c) is present, step c) is carried out after step b);
• the compositions (A) and (C) can be identical or different;
• the composition (B) comprises a total amount of persulfates of less than 10% by weight, relative to the total amount of composition (B).

A method for reducing damage to keratin fibers comprising:

• applying to the keratin fibers a composition comprising:
• i) one or more chemical oxidizing agents chosen from hydrogen peroxide, hydrogen peroxide-generating systems other than peroxygenated salts, or mixtures thereof;
• ii) one or more compounds chosen from carbonates, carbonate-generating systems, bicarbonates, bicarbonate-generating systems, or mixtures of two or more thereof;
• iii) one or more silicates;
• or
• mixtures of two or more thereof.

A multicompartment device comprising:

• a first compartment comprising a composition (B1) comprising:
• one or more chemical oxidizing agents chosen from hydrogen peroxide, hydrogen peroxide-generating systems other than peroxygenated salts, or mixtures thereof;
• and
• a second compartment comprising a composition (B2) comprising:
• one or more compounds chosen from carbonates, carbonate-generating systems, bicarbonates, bicarbonate-generating systems, or mixtures thereof;
• and
• one or more silicates;
• optionally one or more coloring agents;
• and
• optionally one or more compounds D chosen from organic acids, amino acids, chitosans, vitamins B, vitamin C, vanillin, salts thereof, solvates thereof, or mixtures of two or more thereof;
• and
• a third compartment comprising one of a composition (A) or a composition (C), wherein composition (A) comprises:
• one or more compounds D chosen from organic acids, amino acids, chitosans, vitamins B, vitamin C, vanillin, salts thereof, solvates thereof, or mixtures of two or more thereof, wherein the total amount of compounds D ranges from 1% to 20% by weight, relative to the total weight of composition (A);
• and
• optionally one or more coloring agents;
• wherein composition (C) comprises:
• one or more compounds D chosen from organic acids, amino acids, chitosans, vitamins B, vitamin C, vanillin, salts thereof, solvates thereof, or mixtures of two or more thereof, wherein the total amount of compounds D ranges from 1% to 25% by weight, relative to the total weight of composition (C);
• and
• optionally one or more coloring agents;
• and
• optionally a fourth compartment comprising a composition (B3) comprising one or more coloring agents.