Evaluation of the Fastness Properties in Compound Shades of Natural Dyes by Two Extraction Methods

Abstract

Clothing and textiles play an important role in human history by keeping infectious and toxic material away from the body. Natural dyes are an eco-friendly dye which are derived from plants and minerals and traced back more than 5000 years. A small variation in the dyeing technique or by use of different mordants with the same dye creates totally new colours. The purpose this project was to evaluate the fastness properties of compound shades of natural dyeing by two extraction method (Aqueous & solvent). This study therefore concerns with the aqoues and solvent extraction of a natural and investigation of factors that influence the colour yield. Natural dyes extracted from different sources from the nature like Curcuma Onga, Lawsonia Inermis. These natural dyes are however non substantive hence their application require the assistance of mordant. The synthetic (alum) and natural mordant(myrobalan) was used for fixation of dyes on the 100%cotton fabric. In this experiment pre & post mordant method is used. For solvent extraction, Soxhlet apparatus used with methanol as a solvent and for aqueous extraction water bath boil is used. The evaluation of colour strength by K/S value and fastness properties such as washing and light fastness were carried out using Spectrophotometer respectively.