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Relative Effectiveness of Selected Sunscreens
Stephen I. Katz, MD
Arch Dermatol. 1970;101(4):466-468.
Abstract
Four topical sunscreening preparations were tested in midday clear bright Florida sunshine. Five percent para-aminobenzoic acid (PABA) in 70% ethanol and a cream containing benzophenone derivatives oxybenzone and dioxybenzone (Solbar) were found to be good sunscreens. A new formulation using an ester of a modified PABA (Blockout) was less protective. All of the agents washed off when the subjects swam for ten minutes. Three of nine subjects complained of a burning sensation and developed an immediate bright erythema 30 minutes after application of Blockout and exposure to the sun.
Author Affiliations
Miami, Fla
From the Department of Dermatology, University of Miami School of Medicine, Miami, Fla.
Footnotes
Accepted for publication Jan 20, 1970.
Reprint requests to the Department of Dermatology, University of Miami School of Medicine, PO box 875, Miami, Fla 33152 (Dr. Katz).
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