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Unilever Patents

Published April 11, 2006
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Patent No. US 6,994,733 B2: An electrochemical method and system for dyeing and highlighting hair has been assigned to Unilever Home & Personal Care USA, division of Conopco, Chicago, IL. The patented procedure includes applying an oxidative dye precursor mixture containing at least one primary intermediate and contacting the oxidative dye precursor mixture on the hair with an electrode system.

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