Sutrisno JDAP, Sumarwahyudi. Natural Coloring Innovation: Analysis of Ecoprint Process on Leather at NURB Leather Gallery Malang . ijess [Internet]. 2025 Apr. 15 [cited 2026 Sep. 14];6(1):23-32. Available from: http://ejournal.aissrd.org/index.php/ijess/article/view/369