Tannery production process in Indonesia is still using chromium sulfate or mimosa in general. Gambier (Uncaria gambier Roxb. ) extract could be used as material for tanners because it contains tannin. https://www.diegojavierfares.com/mega-choice-Seattle-Seahawks-NFL-Printed-Camo-Socks-p11205-top-buy/
Characteristics of Tanning Leather Using Gambir on pH 4 and 8
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