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January 21, 2023
By: Christine Esposito
US Patent No. 11,554,083 B2 (Jennie Teague, Katie Hardie); James Robinson Group Ltd., in a patent filed by Vivimed Specialty Chemicals UK Limited, Huddersfield, UK, has patented a method for coloring hair that entails treating hair with a composition comprising dihydroxyacetone (DHA). The DHA is in free form or in salt form. The method entails drying the hair (optional) and heating the treated hair, including the applied DHA composition, to a temperature of 100-250°C. The composition does not include additional colorants.
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