Effects of Different Mordanting Techniques on Fabrics Dyed with Coconut Husk Dye and Colour Fastness Properties
Abstract
The dyeing potential of Cocos nucifera (coconut) husk extracted by microwave-assisted extraction was evaluated with three different mordanting methods: pre-mordanting, meta-mordanting, and post-mordanting. Natural dye from coconut husk powder was extracted separately using 0.8 M sodium carbonate (Na₂CO₃) and 0.8 M sodium hydroxide (NaOH) solution. The dyeing and mordanting procedure were carried out with 12% tannic acid as biomordant. This study explores the effect of different mordanting techniques on three fabrics, cotton, crepe, and lycra, when dyed with the natural dyes of coconut husk. The purpose is to investigate the effects of different mordanting techniques on colour fastness (fastness to wash, rub, and perspiration). A comparison of the three mordanting techniques showed that the meta-mordanting method gave the highest depth of shade and colour values on cotton, crepe, and lycra. Meanwhile, the colour strength values are higher on fabrics with the Na₂CO₃ dye. The colour strength for all fabrics dyed with the Na₂CO₃ dye follows the order: meta-mordanting > post-mordanting > pre-mordanting. Of the three fabrics studied, lycra gave the deepest shades, as well as superior wash and perspiration fastness. The resulting wash and perspiration fastnesses of the dyed lycra fabrics are good to excellent.
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