Tanning process with 20% syntan gave the best result.
Widari Widari, Rambat Rambat, Suparti Suparti 2013, 'Pembuatan kulit atasan sepatu bebas krom', Majalah Kulit, Karet, dan Plastikhttp://ejournal.kemenperin.go.id/mkkp/article/view/197/171. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)