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Determination of Tannin Content in Mangkokan Leaves (Polyscias Scutellaria (Burm.F.) Fosberg) and Guava Leaves (Psidium Guajava L.) Using UV-Vis Spectrophotometry. JPS 2025, 8 (4), 3048-3057. https://doi.org/10.36490/journal-jps.com.v8i4.972.