Perubahan Warna pada Pewarnaan Alami Daun Jati (Tectona grandis) Berdasarkan Perbedaan Jenis dan Konsentrasi Bahan Fiksasi

Abstract

The need for dyes is increasing along with the growth of population and printing materials produced. Thus, it is necessary to increase dye production in order to meet people's needs. Teak leaves (Tectona grandis) are a plant that can be used as a natural dye which contains anthocyanin dye which can provide red, purple and even dark red colors. To obtain dyes that have good color fastness, it is necessary to carry out a mordant/dye fixation process. Fixation functions as a bridge between natural dyes and fabric fibers so that they can bond properly. This research aims to analyze the effect of the type of fixation material and the concentration of the fixation material on the coloring results on cotton fabric media. The method used to obtain natural teak leaf dye in this research is the boiling method. This research uses three types of fixation, namely lime (CaO), alum, and tunjung (FeSO4). The concentrations used are 25g/l, 50g/l, and 75g/l. In the washing treatment process, the results of the color difference (ΔE) were obtained with 25% lime treatment, namely 4.02, the lowest and 75% lime, namely 8.04, the highest, with the average influence category being large. Alum fixation has the brightest color, lime fixation has the reddest color, and tunjung fixation has the darkest color. Differences in the type of fixation material affect the coloring results and color fastness to washing on cotton fabric. Tunjung fixation was the best fixation material in this study, but Tunjung fixation changed the color to dark.