Leaching and usage of tannin from Lawsonia inermis (Henna Leaves)

Abstract

The aim of this research was to determine the tanning content of Henna leaves (Lawsonia inermis) and study the factors that affect the leaching process. Application of extract was made to produce crust and finished leather of sheep skins. The factorial factors and their levels were namely: Temperature (30-60) C ○ , time (30-60) minutes, solvent solid ratio (1:20-1:30) and degree of mixing (without -with). These factors were replicated towice and found to be significant. Thus the operating levels were specified and all trials were made at the specified factorial levels. The extract produced was used for retannage of wet blue sheep skins and processed through crust until finishing. The leather produced was analysed for physical testing, including tensile strength, elongation, load at grain crack, load at grain burst, and thickness. The results were compared with the standard specification and found to be satisfactory. The color of the product was good and fast to light. In conclusion it is adviced that Henna leaves (Lawsonia inermis ) can be used in powder form for retannge and dyeing of leather. This is because the leaching time is short and is less than the time requind for the retanning process.