Hair Coloring Method

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By: Christine Esposito

Editor-in-Chief

US Patent No. 9,345,658 B2; The Procter & Gamble Company has patented a method for coloring hair. It entails the following steps: mixing a first dye composition with a first developer composition to obtain a first hair coloring composition, wherein the first dye composition comprises one or more oxidative dye precursors and one or more alkalizing agents and the first developer composition comprises one or more oxidizing agents; applying a portion or all of the first hair coloring composition; mixing a second dye composition with a second developer composition to obtain a second hair coloring composition, wherein the second dye composition comprises one or more oxidative dye precursors and one or more alkalizing agents and the second developer composition comprises one or more oxidizing agents, wherein the individual concentrations of the oxidative dye precursors, the alkalizing agents, and the oxidizing agents comprised in the second hair coloring composition are lower than the individual concentrations of the oxidative dye precursors, the alkalizing agents, and the oxidizing agents comprised in the first hair coloring composition; and applying a portion or all of the second hair coloring composition to the hair.

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