Papers by Keyword: Washfastness

Abstract: We investigated whether the fastness properties of wool textiles could be enhanced by modifying the dyeing and post-dyeing procedures in ways designed to increase the crystallinity of dyes in the wool. In one approach, the dyebath was maintained at 98°C for three hours, in another, dyed fabric was rapidly cooled. In a third approach, dyed fabric was alternately held in solutions of 80°C and 40°C. Commercial acid levelling and acid milling dyes were used. Fastness to light and washing were assessed by standard methods, and samples were exposed to sunlight behind glass for 12 months. The crystallinity of the dyes in the wool was assessed by x-ray diffraction. Small increases in lightfastness and crystallinity occurred, with the two classes of dyes behaving differently. This preliminary study demonstrated that the concept of increasing the crystallinity of dyes in wool to improve lightfastness warrants further investigation.

Abstract: In this study, natural colours were produced from Melastoma Malabathricum L.’s (Senduduk) plant. The dyes were extracted from the petal part of the plant using solvent extraction method of acidified methanol and methanol. The natural colours were then converted into powder form of nano size scale using a ball mill grinder. Silk fabrics were used as the substrate and dyed using several natural and synthetic mordant. The use of different solvents for extraction and mordant for dyeing resulted in different colour shades on the silk fabrics. The color fastness to washing tests revealed colour fastness to washing ranging from 3 – 4/5 and the change in color ranging from 3/4 – 4/5. The findings will benefit and promote the dyeing and printing industry such as batik manufacturers and local fashion industry in using natural dyes. On the other hand, dyes from plants can also be used as an alternative to synthetic dyes for dyeing natural silk fibers.