Natural Dyeing of Wool by Madder (Rubia tinctorum L. Root Extract Using Tannin based Biomordants: Colorimetric, Fastness and Tensile Assay
In this work, the natural dyeing behavior of woollen yarn with madder (Rubia tinctorum L. root extract was studied. The effects of different tannin rich plants (Rhus coriaria, Eucalyptus, Terminalia chebula, Quercus castaneifolia, Pomegranate) extract as biomordants and alum (as a chemical mordant) with two mordanting procedures (pre and metamordanting) on color characteristics of the dyed samples were also investigated. The CIEDE2000 values, color strength (K/S) washing fastness and tensile property of the mordanted and dyed samples were assessed. Visually, a range of hues from orange to brownish red were obtained. In general, pre biomordanted samples with Rhus coriaria (10 %owf) Eucalyptus (10 %owf) Terminalia chebula (5 %owf) Quercus castaneifolia (5 %owf) and Pomegranate (5 %owf) showed almost the same color difference (DE00) and wash fastness values compared to those treated with 3 %owf alum. Finally, it was concluded from the comparative studies that the biomordants have good potential to be considered as alternatives to the common chemical mordants.
Fibers and Polymers