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This research was concerned with natural biopreperation extraction from plant an abundantly occurring plant namely Rhubarb (Rheum. Undulatum .L,), nettle(Urtica.Cannabina.L), available almost everywhere in Mongolia and with the application of this dyeing bio-preperation for Mongolian goat cashmere dyeing by exhaustion process. Optimal results were achieved when dyeing with a rhubarb at 80 C for 40-45 minutes and at pH 4.5 and for dyeing with a nettle at 80 C for 40-50 minutes and at pH 5.0. Bio-preperation extract were applied on cashmere fabric with alum, copper, ferrous, magnesium sulfates mordants with four different dyeing conditions. An exception was when the fabrics were dyed with FeSO4 mordant, resulting in a shade of dark brown for two plants. The colour fastness to washing and rubbing after dyeing the cashmere fabrics treated with the mordant was investigated, the results of which showed fair to good rubbing fastness, specially the colour fastness to washing was at a good to very good level. The metal salts are used by mordants in the natural dyeing proceesing are increased 1-2 grade of colour fastness rating of dyed cashmere fabrics. The results confirmed that natural dyes from rhubarb and nettle have potential applications for fabric dyeing and producing ultraviolet (UV) protective cashmere fabrics.

Eco-Dyeing of Cashmere with Bio Preperations of Rheum Undalitum L. and Urtica Cannabina L.