Four thiolsulfato azo dyes (DSSO3Na) and three of the corresponding sulfonate - dyes (DSO 3Na) have been prepared and their dyeing behavior on wool studied. Three of the thiolsulfates were found to be unexpectedly good dyes, especially in regard to washfastness. The thiolsulfate dyes under certain conditions of application undergo partial decomposition, so that some dye becomes bound covalently to the wool and some is converted to the symmetrical dye disulfide (DSSD).
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