Dyeing Studies of Wool Fibers with Madder

2011 WordsFeb 26, 20188 Pages
In this study, the dyeing behavior of wool fabrics with madder has been studied. Also, the effect of different mordants (potassium dichromate, stannous chloride, alum, ferrous sulphate, lime, copper (I, II) sulphate, cobalt chloride, and nickel chloride) as well as three mordanting procedures namely pre-, meta- and post-mordanting on color characteristics of the dyed samples has been investigated. The adsorption isotherm of madder on wool fibers was found to follow Freundlich type of adsorption. The addition of salt and acid (pH 4.5) to the dyebath resulted in an increase of adsorption. In relation to mordanting tests, the use of different mordants and mordanting procedures gave various color characteristics on dyed wool fabrics. The results showed that all the dyed samples, mordanted and unmordanted, were in the first quadrant of CIEL*a*b* color space. Mordants such as potassium dichromate, ferrous sulphate and copper (I, II) sulphate led to the darker and lower chromaticity compared to unmordanted dyed sample while mordants stannous chloride, alum resulted in the lighter and higher chromaticity values. Mordanting with the chlorides of cobalt and nickel showed the minimal color difference (∆E) with the unmordanted dyed sample. The fastness properties indicated that in general wash and light fastness of the mordanted samples were higher than the unmordanted one. Key words: wool, madder, mordant, fastness properties, natural dye. Introduction: The use of natural dyes for

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