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Hair Dye Patented with

Published November 14, 2005
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Patent No. US 6,558,433 B2: Swiss researchers for Wella AG, Darmstadt, Germany, were awarded a hair dye patent comprising the following steps: providing an oxidation dye precursor composition that has at least one coupler compound and at least one developer compound; mixing the oxidation dye precursor composition with an oxidizing agent to form a ready-to-apply dye mixture and applying to hair.

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