The Effect of Titanium Dioxide and Porang Starch (Amorphophallus oncophyllus) Combination on the SPF Value and Physical Properties of Sunscreen Lotion Formulation - Fauzia, Afifah Hasna; Vanda Pertiwi, Deasy; Saputri, Asti Rizki; Khoirunnisa, Afifah; Bestari, Angi Nadya (Universitas Ahmad Dahlan, 2025)