Multi-Tonal One-Step Dyeing Patented by Henkel

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By: TOM BRANNA

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US Patent No. 9,918,910 B2; Henkel AG & Co. KGaA has patented a method for the oxidative dyeing of keratinic fibers that comprises the following steps in the indicated sequence: a) applying a cosmetic agent (M1) to the keratinic fibers, b) allowing agent (M1) to act on the keratinic fibers for a time period of 30 seconds to 40 minutes at a temperature of at least 25°C., c) applying a cosmetic agent (M2) to the keratinic fibers treated with cosmetic agent (M1), d) allowing cosmetic agent...

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