Hi. I've been testing some leather samples for colorfastness to perspiration but they show bad performance. Does anyone know if I should cure them in acid or alcohol or with alkali for it to retain the dye better?
Colorfastness of Dyes
There are two key factors that may improve the wet colorfastness of your dyed leather. The first is the quality of the dye to substrate bond and the second is the efficiency of the wash off stage of the dyeing process. Any given leather dye should have a published sweat fastness rating and clearly you should avoid the worst offenders. It is also possible to use after treatments such as metal-complex formation or after tanning to reduce staining by residual dye solubility. The classic paper on wetfastness improvement is: ‘Chemical reactions between dyes and wool’ AN Derbyshire, GR Tristram - Journal of the Society of Dyers …, 1965. More recently Thiophene-Based Azo Dyes that establish covalent chemical links with the substrate have been developed which have good colorfastness to sweat.
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