This study was aimed at determining the effect of dilution of active ingredients of chemical sunscreen consisting of octyl-methoxy cinnamate and benzophenon-3 on its potency, in terms of SPF (sun-protection factor) and APF (UV-A protection factor). Factors of sun UV-A protection factor had been tested in the Laboratory of Photobiology, Department of Dermato-Venereology Dr. Sardjito General Ho…