Eco-friendly Dyeing of Wool with a Mixture of Natural Dyes

摘要

The extraction of natural dye from a mixture of Terminalia arjuna fruits and Madder with different percentage w/w (80:20%, 70:30% and 50:50%) was optimized and the resulting extract was used to further optimize its dyeing conditions on wool by exhaust method. The purpose of this study is to develop an environmentally friendly dyeing process and good fastness properties. Dyeing without any mordant was compared with those obtained with the three different mordanting methods using various metal salts and combination of these salts. The dyeing behaviors of different mordants and combination of mordants have been studied with respect to their influence on color and fastness properties. It was found that as the percentage of Madder increased in the mixture from 0, 20%, 30%, and 50%, a better color strength was obtained and a bathochromic shift was also obtained from mustard brown to reddish brown shades. Furthermore, dyeing with mordants and combination of mordants has moderate to very good fastness properties. Finally, the mechanisms of mordant interaction with wool fiber have been briefly considered.