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Dye extraction from Rheum emodi for colouring silk using natural mordants

2015; Applied and Natural Science Foundation; Volume: 7; Issue: 1 Linguagem: Inglês

10.31018/jans.v7i1.585

2231-5209

Meenu Srivastava, Dolly Mogra, Prasoon Gupta,

Chromatography in Natural Products

Applicability of natural dyes has increased several folds in the past few years due to the eco-friendly approach of the people. This paper concerns with the dyeing of silk fabric with colorant extracted from Rheum emodi (commonly known as rhubarb, himalayan rhubarb, Indian rhubarb) in the presence of selected five natural mordants. Extract using hot percolation with methanol was (27.55%) found suitable and maximum absorption (?max) was observed at pH of 10 in aqueous solution. A wide range of shades ranging from yellow to olive green were obtained. As per the visual evaluation Concentration (0.1%), dyeing time (60 min.), mordant concentration (2%) and pre mordanting method were observed optimized for dyeing. From the results of fastness grade for sunlight and washing it is concluded that the samples mordanted with Harda (Terminalia chebula) and Amla (Phyllanthus emblica) were excellent followed byAnar (Punica granatum), Bahera (Termirudia belerica) and Katth (Acacia Catechu).