Abstract
Improved experimental methods have shown that the conclusions drawn in earlier work [1, 2] are only partially correct. The kinetics of hydrolysis of Type 3 dye-fibre bonds have been shown to be complex and not first-order as believed. The reason lies in the variation of the internal pH of the fibre as dye is removed. Redetermined bimolecular hydrolysis constants for H-acid derivatives show that the more ready hydrolysis of Type 3 dyeings from red H-acid dyes is associated with the formation of a highly active species in the internal pH region 3-3.5. The problems these findings pose for the establishment of a ‘bleaching’ test are raised.
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