Abstract:In this research, leather tanning using gambir processing liquid waste has been done. The research was done by varying the percentage of adding alum as mordant, respectively 0%, 2%, 4%, and 6% into the waste of gambier processing. The addition of alum crystal was done in step II of the tanning process. The observation was done by investigating several parameters, such as the skin color, physical and chemical properties of the tanned leather-based on SNI 06-0463. 1989 A. The results show that the use of alum cr… Show more
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