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Several complexones and amino compounds have been investigated as to their ability to form alkali-stable coordination compounds with iron, which can be used as mediators for the indirect electrochemical reduction of dispersed organic dyestuffs with different structures. A characterisation of the reducing efficiency can be obtained when the cathodic current maxima of the mediator solution containing the dyestuff is compared with the cathodic peak current without the reducible vat dye.
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Bechtold et al. (1993) studied this question.
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