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Composition for Dyeing Fibers Patented By L’Oréal

November 2, 2007

Patent No. US 7,285,137 B2:
A composition for dyeing keratinous fibers comprising, in an appropriate dyeing medium, at least one oxidation base chosen from diamino-N,N-dihydropyrazolone derivatives has been patented by L’Oréal Paris, France.

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