Abstract
― Natural dyes seem to be more profitable on human and environmen t, and recently they could be considered as a better alternative to synthesized dyes. The aim of the current work wa s to investigate the dyeing property and antimicrobial activity of commercial cotton fabrics dyed with kumazasa (usually called in japan) which is known as conventional japan bamboo leaves. Actually, the dyeability and antimicrobial property of dyed fab ric with natural mordant/dyeing was compared with synthetic mordant/dye process. The results of this study obtained are as follows. The apparently colour of kumazasa leaves extract dyed fabrics showed with light green or slightly yellow-green. In colorfastn ess to washing, △E and K/S values of dyed fabrics with natural chitosan as mordant used was shown to be more excellent results , than was synthetic mordant used. However, the decrease rate w as recorded nearly 50% when washing repeated 20 cycles. In result of antimicrobial effect for bacteria, the dyed fabrics didn't s how the significant antimicrobial activity to the both dyed with an d without mordant. Results of this investigation considered tha t low-cost, natural, bio-mordant are relatively effective in natu ral coloration.
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