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April 1970

Relative Effectiveness of Selected Sunscreens

Author Affiliations

Miami, Fla

From the Department of Dermatology, University of Miami School of Medicine, Miami, Fla.

Arch Dermatol. 1970;101(4):466-468. doi:10.1001/archderm.1970.04000040088017

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.

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