Abstract
The objective of the present study was to compare between the mixed dyeing of wool fiber in one and two dye baths using natural indigo (<i>Indigofera tinctoria</i>) and madder colorants (<i>Rubia tinctorum</i>). Based on the reduction and oxidation reaction conditions under the same dyeing mechanism for the indigo and madder colorants, the exhaustion rate of the mixed dyeing in two dye baths was higher than that for mixed dyeing in one dye bath. The poor exhaustion rate that was achieved when dyeing in a single dye bath indicated the incompatibility of both dyes when mixed in one dye bath. However, both methods achieved a rigid fixation as confirmed by washing-fastness test 105C6A01.
Highlights
Natural dyes produce an extraordinary diversity of rich and complex complementary colors
Dyes that were removed from the sample that were dyed in two baths during the soaping phase were very little in the dyeing process, and they were not taken into account in the calculation of the fixation dye rate
This study confirmed the incompatibility of mixing indigo and madder colorants in one dye bath
Summary
Natural dyes produce an extraordinary diversity of rich and complex complementary colors. Larger dye quantities and longer dyeing times are required by natural dyes, and the poor fastness properties of almost all color ranges hinder and limit their development and use, in industry. Mohd Yusuf et al examined the effect of color and fastness properties of wool fibers that were dyed with Rubia cordifolia as a natural dye and Acacia catechu as an anchoring agent. Cristae et al investigated the effect of some commonly used antioxidants and ultraviolet absorbers on the light fastness of madder, weld, and woad on cotton yarn They found that vitamin C and gallic acid were most effective in improving the natural dyes [10]. Younes Chemchame et al.: Comparative Study Between Mixed Dyeing of Wool Fiber in One and Two Dye
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