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L’Oréal Patents Hair Dye

Published November 14, 2005
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Patent No. 6,451,067 B1: L’Oréal S.A. researchers, Paris, France, patented a process for dyeing hair without oxidation using at least one compound chosen from aldehydes, ketones, quinones, diiminoisoindoline derivatives and 3-aminoisoindolone derivatives, and at least one heterocyclic cationic amine.

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