DYEING SILK WITH LATERITE SOIL FROM SURIN PROVINCE: DEVELOPMENT OF COLOR SHADES AND EVALUATION OF COLORFASTNESS

Abstract

The study of dyeing-silk processes using laterite soil was aimed to investigate the effects of the mordants towards dyeing silk using laterite soil, pH value, color-saturation values using the CIELab system, and colorfastness to washing and light. The research results indicated that fermenting 2 kilograms of laterite soil with 1 liter of water for 30 minutes provided the best result. Additionally, the mordant solution included alum, tamarind leaves, and thorn spinach leaves. The silk threads were divided into two sets: The first set was dyed using only laterite soil for 1, 12, and 24 hours, while the second set was dyed using laterite soil in combination with the previously mentioned colorants. After dyeing the silk, its color resulted in an orange shade. Its lightness (L*) value of the shade was between 68.75 to 74.21, its redness (a*) value was between 14.61 to 18.24, and its yellowness (b*) value was between 23.22 to 29.16. The darkest shade of silk threads was dyed using laterite soil for 12 hours and was subsequently boiled with tamarind leaves for 15 minutes. The colorfastness test was revealed that the level of colorfastness to washing and the light was good to excellent (rated 4/5 to 5). In addition, dying the silk with laterite soil was a crucial way to employ locally natural materials to develop silk products, enabling the extraction of dyes that have been safe for both humans and the environment.