Abstract
The possibility of elimination of chromium in dye effluents during application of afterchrome dyes has been investigated. Eight commercially available azo mordant dyes were used in dyeing of wood fabric and aftertreated with iron (II) and iron (III) salts. Colour and lightfastness of received dyeings was compared with those obtained with the use of traditional chromium-aftertreated method. The structure of some complexes formed on wool fibre was characterised by negative ion fast atoms bombardment spectroscopy (FAB) and HPLC analysis. It was found that mordant dyes with ortho, ortho′-hydroxyazo chelate system aftertreated with iron salts form metal–dye complexes of 1:2 type.
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