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January 1966

Sunlight Protection in Normal Skin: By Absorptive Filter Chemically Induced in Stratum Corneum

Author Affiliations


From the Department of Medicine, University of Minnesota Hospital, Minneapolis.

Arch Dermatol. 1966;93(1):106-111. doi:10.1001/archderm.1966.01600190112025

The protective effect of a sunscreen filter chemically induced in normal skin was tested by using direct sunlight exposure to assure effectiveness. The topical preparation was applied immediately after mixing. Washing with soap and water did not remove the protective filter. Greater protection resulted from repetitive use or increase of the applied quantity, or both. Separate application of either component of the mixture produced no significant protection in clinical trials and in vitro experiments.