The Effect of Mordan on The Color Depth of Silk Fabric Dyed with Rambutan (Nephelium Lappaceum) Peel Extract

Synthetic dyes are usually carcinogenic; therefore, it is necessary to use alternative dyes to reduce the use of synthetic dyes, namely by using natural dyes. This study aims to determine 1) How depth the color of the silk cloth that is dyed using rambutan peel extract; 2) Is there an effect of using mordant on the color depth of the silk fabric that is dyed with rambutan peel extract. Extraction is done by boiling the rambutan peel for 1 hour. The dyeing of the silk cloth is carried out for 15 times. The test was carried out by testing the color depth on silk cloth that was dyed with rambutan peel extract with mordan alum, tunjung, and calium oxide. The results of the color depth test have the highest value on the use of tunjung mordan with an R% value of 11.94 for very dark criteria, then followed by mordan alum with a value of 47.15 and the lowest value for using calium oxide mordan with a value of 58.87 for light criteria. The results of calculations using the Kruskal Wallis formula show that there is an effect of the use of mordant on the color of silk cloth dyed with rambutan peel extract as indicated by the value ꭓ2count = 9, 359 with a significance value of 0.025 <0.05.