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Home › (Dis)symmetric azomethine-type direct dye comprising at least one pyrazolopyridine unit, process for dyeing keratin fibers using this dye

(Dis)symmetric azomethine-type direct dye comprising at least one pyrazolopyridine unit, process for dyeing keratin fibers using this dye

US Patent 10731038 · Granted Aug 4, 2020

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