Modification of Natural Dye Extracted from Cissus populnea stem Bark on Cotton Fabric.

Abstract

Extraction, modification and testing of natural dye from Cissus populnea stem bark and its application on cotton fabric was studied. Modification of dye was carried out using 3, 7-bis (dimethylamino) phenothiazine-5-ium chloride and 2-(N, N-dimethyl)-4-aminophenyl. These gave a variety of colours as the pH tends to shift towards the acidic scale. Blue-violet-purple coloration was observed when 3, 7-bis (dimethylamino) phenothiazine-5-ium chloride was used as modifier and violet-red coloration was observed when 2-(N, N-dimethyl)-4-aminophenyl was used as modifier (absorbs at 592 nm to 540 nm). Wash fastness test was carried out with and without a mordant. It was obtained that, without a mordant, there was a fair dyed-cotton fastness but excellent dyed-cotton fastness was achieved using a mordant, i.e. the dye works best with a mordant than without a mordant. This research has create a scientific means of effecting color change on natural dye by either increasing or reducing the dye pH, hence improving the wash fastness of cotton fabric.