Determination of the Sun Protection Factor (SPF) of Ethanol Extract Gel from Arumanis Mango Leaves (Mangifera Indica L. Var. Arumanis) As a Sunscreen Using the UV-Vis Spectrophotometry Method. JRKI 2026, 8 (1), 1-10. https://doi.org/10.33759/jrki.v8i1.909.