Dye extraction from eucalyptus leaves and bark and application for silk and cotton fabric dyeing

Abstract

This research was concerned with dye extraction from the leaves and bark of eucalyptus. The best suitable condition for extraction was at 100 degree Celsius for 1 hour and liquor ratio of material: solvent was 1:40. Extraction with distilled water gave the maximum percentage of total solid. The suitable condition for pre-mordanting process on silk and cotton fabric was at 30 degree Celsius for 10 minutes with mordant compounds 0.1 %owf. Silk and cotton fabric were treated with pre-mordanting process before dyeing experiments, in order to facilitate dye absorbancy of fabric such as silk dyeing at 90 degree Celsius for 40 minutes, cotton dyeing at 60 degree Celsius for 40 minutes. The best result was achieved when liquor ratio between fabric and dyed solution as 1:30 was employed. Silk dyed in the solution extracting from the leaves and bark of eucalyptus with mordant compound displayed yellow - brown colour except fabric using ferrous (Fe) mordant exhibiting the shade of dark grey. For cotton, shade of yellow - crange was obtained, except fabric using ferrous (Fe) mordant displaying the shade of pale grey - grey. Silk and cotton fabrics treated with pre-mordanting and dyeing process has presented the properties of colour fastness, washing, water and perspiration in good to very good level whereas colour fastness to light and rubbing was in fair to good.