UV-Vis spectroscopical
and colorimetric analysis of natural dyed woollen fabrics employing a combination
of chemical and botanical mordants
Singh Shyam Vir
Res. J. Chem. Environ.; Vol. 29(5); 8-16;
doi: https://doi.org/10.25303/295rjce08016; (2025)
Abstract
The current study aims to evaluate the colorant fastness grades and color strength
on woven fabrics that were dyed by botanical dye derived from Symplocos racemosa
leaves. A variety of botanical and chemical mordants, such as lime extract + CuSO4,
lime extract + K2Cr2O7, lime extract + FeSO4 and lime extract + SnCl2, were used
in the experiments, with corresponding ratios of 1:1, 1:2 and 1:3. Here, the dyeing
process was combined with a mordant technique such as simultaneous mordanting technique.
This study also includes fastness testing of dyed materials. Under UV-Vis Spectroscopic
investigation, variation in the absorbance values and a wide range of color shades
were detected with varying mordant ratios and their combinations.
The lime extract + K2Cr2O7 of bio- and chemical mordants showed the highest value
of absorption. The fastness grades of the dyed fabrics to light, perspiration, wash
and rub have also been evaluated and found to be fair to good. Use of natural dyes
in large scale in the textile industries may benefit from this observation with
this species as Symplocos racemosa.
