Choosing the Appropriate Mordant via Multi-criteria Decision Making Methods in Natural Dyeing with Tea Extract

This study examined the usability of natural dye obtained from tea for dyeing woolly Bayburt Ehram, a traditional weaving, and the effects of natural mordants and chemical mordants on dyeing numerically. Bayburt Ehram is woven from 100% wool fibre. In this study Bayburt Ehram woven of 100% wool fibre was dyed with 15 different concentrations of 3 different mordant substances. Light fastness and washing fastness tests of the samples were done and colour differences and colour productivity calculated using CIE L*a*b colour space system were compared. VIKOR method was used for the optimization of dyeing parameters and step-by-step solution was shown. This is one of the multi-criteria decision making methods, and aims to rank and choose the best among many alternatives and enables the decision maker to take a decision using agreeable solutions and acceptable advantage and stability for a multi-criteria problem. It is an alternative and effective method to use for problems. Then ranking was done using GREY RELATIONAL ANALYSIS (GRA) and TOPSIS method and the results were compared using Spearman rank order correlation test and the most effective method was chosen. The experimental results show that using potassium aluminium sulphate mordant gives the best results in terms of colour difference and colour yield for dyeing the woolly fabric with tea.