US 12,274,772 B2. Peter Bauer, Steven Breakspear, Bernd Nöcker, and Ines Rabelo De Moraes, all of Darmstadt, Germany. Assignee: Kao Corporation, Tokyo, Japan.

Kao researchers patented a kit-of-parts for bleaching keratin fibers. The bleaching composition includes one or more persalt(s) and/or peroxy salt(s) at a total concentration in the range of 20% to 80% by weight, calculated to the total weight of the bleaching composition A, and one or more alkalizing agent(s) selected from metasilicates, carbonates, bicarbonates, and/or their alkali or earth alkali salts, at a total concentration in the range of 1% to 20% by weight, calculated to the total weight of the bleaching composition A.

The aqueous oxidizing composition has a pH in a range of 1 to 6 and comprising hydrogen peroxide.

The mannitol has a total concentration in the range of 0.001% to 5% by weight, calculated to the total weight of the composition C, wherein the bleaching composition A comprises less than 5% by weight of water, calculated to the total weight of the bleaching composition Awherein a total concentration of mannitol in a ready-to-use mixture obtained by mixing the bleaching composition A, the aqueous oxidizing composition B, and the composition C, is in the range of 0.00002-0.05% by weight, calculated to the total weight of the ready-to-use mixture.