Natural dye extracted from Rhus pentaphylla bark was applied on wool and silk fabrics by an exhaustion dyeing process. Aluminum, tannic acid, and stannous chloride were used as mordants. The dyeing was conducted with and without metallic salt mordants, using three different mordanting methods: pre-mordanting, meta-mordanting, and post-mordanting. A large variety of pale to dark reddish-brown color shades was obtained. The color of each dyed material was scrutinized in terms of the CIELAB (L*, a* and b*) and (K/S) values. The color fastness to washing, rubbing, perspiration, and light of the dyed samples was determined according to ISO standards methods. Optimum results were obtained when dyeing with 7g of the dye at pH 2, a temperature of 100°C during 60 minutes for both wool and silk fibers. Dyeing fastness had mostly been good to very good level with the exception of the fastness to light which was medium.
H. Ghouila, W. Haddar, M. Ben Ticha, N. Baaka, N. Meksi, M.F. Mhenni, H. Ben Jannet
Rhus pentaphylla, tannins, natural dyeing, wool, silk, mordanting