In situ synthesis of pigments in keratin fibres

TL;DRAbstract

In the present work an alternative dyeing method based on in-situ synthesis pigments in keratin fibers e.g. wool and hair is illustrated. Permanent iron dyes and dyes formed by direct diazotation of wool are developed for colouring wool, while quinone based pigments with and without metal are investigated for dyeing wool as well as for human hair. In all cases, application parameters as well as the process parameter are thoroughly investigated. Iron salt with series of benzoic acid is used as a substitute for hazardous chromium containing mordant dyes for wool. Since the colour pigments are formed in situ, coloured effluents which can eventually lead to toxic waste are not produced. By this method excellent washing and light fastness are obtained. This dyeing procedure was accomplished under mild reaction condition which further prevented any additional damage to the wool fibres contrary to the conventional method used. Further quinone based pigments from pure 2,5-dihydroxy-1,4-benzoqu

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