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The effect of various anti‐setting systems in wool dyeing. Part 4; Sodium tetrathionate based systems
Author(s) -
Kim J,
Lewis D M
Publication year - 2003
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2003.tb00159.x
Subject(s) - tetrathionate , wool , chemistry , dyeing , halide , thiol , inorganic chemistry , sulfur , organic chemistry , thiosulfate , materials science , composite material
The tetrathionate anion has the potential to oxidise thiols specifically to disulphides; this property has been investigated in this paper from the point of view of using tetrathionate as an anti‐setting agent in wool dyebaths. It was found that at pH 3 the addition of tetrathionate actually made the degree of permanent set greater than in its absence; however at pH 5 and pH 7 significant anti‐setting benefits were achieved. The reason for the apparently contradictory result at pH 3 was found to be the substantivity and subsequent reactivity of thiosulphate anion for wool – this anion is a product of the reduction of tetrathionate by wool cysteinyl thiol residues.