Effect of metallic
mordants on pH and Optical density values of the dyed fabrics by using aqueous extracted
eco-friendly natural dye from shells of Juglans regia
Singh Shyam Vir, Kotnala Shreya and Janathta Mohini
Res. J. Chem. Environ.; Vol. 29(9); 155-163;
doi: https://doi.org/10.25303/299rjce1550163; (2025)
Abstract
The present work explores the potential of eco-friendly phytochromic dyeing of walnut
shells with two different kinds of fibres viz. cotton and silk by using some metallic
mordants such as copper sulphate, potassium dichromate, stannous chloride and ferrous
sulphate. The aqueous extracted natural dye of the walnut shells exhibits good range
of colours with varying shades of warm beige, caramel brown, funnel seed, yellow
beige and golden beige for different metallic mordants for dyeing of cotton fabric
whereas shades like almond white, ochre, golden bronze, warm sand and light beige
are observed in the case of silk fabric by using different metallic mordants. Pre-mordanting
method was used under this study.
The variations in optical density (OD) and pH-values of the solutions (with and
without mordanting w.r.t. pre-mordanting method) were also measured (before and
after dyeing the fabrics) with the help of UV-Vis- spectrophotometer and pH-meter
respectively.
