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Wella Patents Dyeing Agents

September 8, 2006

Patent No. US 7,083,656 B2: Wella AG, Darmstadt, Germany, patented 7-nitro-2, 1, 3-benzoxadiazole and 7-nitro-2, 1, 3-benzthiadiazole derivatives as well dyeing agents for keratin fibers containing these compounds.

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