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L'Oréal Patents Formula For Dyeing Keratin Fibers



Published December 2, 2005
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Patent No. U.S. 6,946,005 B2: L'Oréal, Paris, patented a pyrrolidinyl-substituted para-phenylenediamine derivative substituted with a cationic radical. The use of these derivatives is for dyeing keratin fibers.


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