A dye containing a disulphide link has been prepared. Exchange reactions between the dye‐disulphide and cystine in presence of thioglycollic acid have been shown to occur. Studies on the formation of mixed disulphides with wool cystine are described and evidence of the presence of the dye‐fibre linkage is given. Disulphide exchange may be a feasible method of dyeing wool at relatively low temperatures.
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Asquith et al. (1971) studied this question.
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