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

US Patent 7947088 · Granted May 24, 2011

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