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Home › Dye composition of acidic pH comprising 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one, a para-phenylenediamine, a meta-aminophenol and an oxidizing agent, and processes for dyeing keratin fibers using the composition

Dye composition of acidic pH comprising 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-one, a para-phenylenediamine, a meta-aminophenol and an oxidizing agent, and processes for dyeing keratin fibers using the composition

US Patent 7766977 · Granted Aug 3, 2010

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