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Werkwijze voor het bereiden van in water onoplosbare monoazokleurstoffen door een aminobenzeenderivaat te diazoteren en met een 5-acetoacetylaminobenzimidazolon te koppelen, het verven of kleuren met deze kleurstoffen, alsmede met deze kleurstoffen geverfde of gekleurde gevormde voortbrengselen.