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Composition comprising 2,3-diamino-6,7-dihydro-1H,5H-pyrazolo[1,2-A]pyrazol-1-one and 4,5-diamino-1-(β-hydroxyethyl)pyrazole, kits containing said composition, and process for dyeing therewith

US Patent 7931697 · Granted Apr 26, 2011

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