Putri, M.K. et al. 2026. Variation of HPMC Concentration on the Stability of the Physical Properties of Peel Off Gel Coffee Arabica (Coffea arabica) Peel: Variasi Konsentrasi HPMC terhadap Stabilitas Sifat Fisik Masker Gel Peel Off Kulit Buah Kopi Arabika (Coffea arabica). Jurnal Riseta Naturafarm. 3, 1 (Mar. 2026), 19–29. DOI:https://doi.org/10.70392/jrn.v3i1.1929.