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Putri, M. K.; A’isyah Shafira , S.; Ria Erika Marita Dellima , B. 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). J Riseta Naturafarm 2026, 3 (1), 19-29. https://doi.org/10.70392/jrn.v3i1.1929.