Abstract


The study was undertaken with an aim to study the dyeing conditions of Monkey jack dye on silk yarn. Bark of Monkey jack was used as colorants on silk yarn. The mordants used in the research work were Aluminium Potassium Sulphate, Potassium dichromate, Copper Sulphate and ferrous sulphate. The selected natural dye was extracted by acidic method and the extraction time was optimized from the optical density values. Three mordanting methods namely pre-mordanting, simultaneous and post mordanting methods were also studied in the present work. It has been observed that pre-mordanting method was found to be the best method for all the mordants. Different shades of beige, brown colors were obtained with Monkey jack dye on silk yarn. Fastness grades rated for all the samples were found to be fairly good irrespective of mordants and mordanting methods.


Introduction


Natural dyes have been part and parcel of men's life, since time immemorial. The age old art of dyeing with natural dyes was common in India. Natural dyes can be obtained from natural sources such as vegetable matter, minerals and insects. Early efforts of coloring fabrics were hampered by the fact that some of the dyes are not very colorfast. Eventually scientist found that this defect could be partially overcome by the use of mordants. The natural coloring substances are now developing trends for their use all over the world because of health hazards and toxicity problems created by the synthetic dyes.


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This article was originally presented in ATNT 2007 held on 18-20, June 2007 at Kumaraguru College of Technology, Coimbatore, India. The authors are associated with Department of Clothing and textiles Faculty of Home Science Assam Agricultural University, Jorhat, Assam.