PENGARUH ASAM SEBAGAI MORDAN TERHADAP HASIL PEWARNAAN PADA KAIN KATUN MENGGUNAKAN ZAT WARNA DARI EKSTRAK KUNYIT

Abstract

The increasing demand for natural dyes as an alternative to synthetic dyes, which can pollute the environment, has gained significant attention. Turmeric (Curcuma domestica Val) is commonly used as a natural dye source due to its curcuminoid content, which produces a yellow color. However, natural dyes tend to be less stable and more prone to fading, necessitating the use of a mordant as a binding agent to improve color fastness on fabric fibers. This study aims to examine the effect of using acidic mordants, specifically alum, ferrous sulfate (tunjung), and citric acid, on the dyeing results of cotton fabric using turmeric dye. The methodology involved a pre-mordanting process using alum, followed by a combination of post-mordanting treatments with alum, ferrous sulfate, and citric acid. Cotton fabric samples treated with alum and citric acid produced a bright yellow color, while samples treated with ferrous sulfate resulted in a brownish-yellow hue. The parameters tested included color depth (R%), color fastness to soap washing, and color fastness to staining on white fabric. The results indicated that cotton fabric treated with pre-mordanting using alum and turmeric dye achieved a color fastness rating of 4 (good) for soap washing, with a color depth value of 2.98. The combination of pre-mordanting and post-mordanting using alum as a mordant produced the highest color depth value of 7.03, along with good color fastness performance.