The Study of Natural Dyes from the Hevea Brasiliensis Leaves by using Alum, Copper Sulfate, and Ferrous Sulfate as a Mordant

Abstract

In this research, the para rubber leaves (Hevea brasiliensis) were applied to the silk fabric and the effect of three different mordants such as aluminum potassium sulfate, copper sulfate, and ferrous sulfate, on the dying process was examined. There were 3 dying methods: pre-mordanting, meta-mordanting, and post-mordanting which were used in the ratio of para rubber leaves extracted and water of 1 to 40 at the temperature of 90 °C for 60 minutes. The results showed that the fabric which was applied with alum gave a yellow shade, the fabric applied with copper sulfate gave a brown-green shade while the fabric with the ferrous gave a gray shade. When comparing the results from three different dyeing methods, it was found that dyeing with the meta-mordant method gave the highest color intensity. The fabric with alum mordant gave a color value of lightness (L*), green-red (a*), and blue and yellow (b*) of 62.27, 8.07, and 30.38 respectively. The fabric with copper sulfate gave a color value of L* a* b*of 62.27, 8.07, and 30.38 respectively while ferrous gave a color value of L* a* b*. The color-fastness to the washing of all conditions was very good.