Abstract
The role of sulphamic acid in the afterchrome dyeing of wool has been investigated. It was found that chromium residues in the dyebath effluent were significantly reduced when the commonly used formic acid was either partly or wholly replaced with sulphamic acid. The wash fastness properties of the wool fabric dyed in the presence of sulphamic acid were the same as those of wool fabric dyed by the conventional afterchrome process. There was no significant difference in the wool damage caused during the sulphamic acid‐assisted dyeing process and the conventional formic acid dyeing process.
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