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To the Editor.—
As a sun enthusiast in Florida, I have used several 4-oz bottles of aminobenzoic acid 5% (Pre-Sun) during the last year. I recently reviewed the study of Langner and Kligman, which appeared in the Archives (105:851,1972). The study dealt with the protection afforded by aminobenzoic acid under a variety of clinical conditions. This review prompted me to calculate total amounts needed to provide the protection they observed. They stated the following: When volunteers applied aminobenzoic acid solutions to the entire trunk, as if in preparation for sunbathing, they were found to use quite different amounts, generally between 30μl to 50μl/sq cm. Extrapolating to the entire body surface, it becomes apparent that extraordinary amounts are required. One must apply 1 liter of solution at 50μl/sq cm to cover a surface area of 2 meters. Eight bottles at 4 oz each are sufficient.Incredulous, I applied 50μl and 30μl
Bergstresser PR. Comment on Sunscreen Studies by Langner and Kligman. Arch Dermatol. 1974;109(1):96. doi:10.1001/archderm.1974.01630010068019