An Evaluation of Broad-Spectrum Sunscreens (3): —Determined by Erythema, Immediate Pigment Darkening, and Delayed Tanning—

Abstract

Sun protection factor (SPF) is one of the objective guides for evaluating sunscreens. In this study, we investigated the SPF of a newly designed sunscreen against UVA+B obtained from a solar simulator. We also determined the preventive effect of delayed tanning (DT) and immediate pigment darkening (IPD). The geometric mean of the SPF was either 15.0 or greater. The protection factor (PF) with DT was 12.0 or greater and the PF with IPD was 85.3. This sunscreen was thus found to provide a high degree of protection against erythema, as well as DT and IPD. © 1993, Western Division of Japanese Dermatological Association. All rights reserved.