09.02.19
US Patent No. 10,342,751 B2 (Udo Erkens, Burkhard Mueller); Henkel AG & Co. KGaA, Dusseldorf, Germany, has patented a product for dyeing keratin fibers. It is comprised of two preparation that are packaged separately from one another in a water-soluble film. The first preparation contains at least one colorant from the group of oxidation dye precursors and substantive dyes; and hydrated sodium silicate. The second preparation is comprised of at least one member from the group of percarbamide, percarbonates and perborates.