P-aminobenzoic acid as a sunscreen and its behaviour on the skin

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Abstract
PABA (p-aminobenzoic acid), a highly regarded sunscreening agent, exhibited different absorption characteristics when applied to excised hairless mouse epidermis than when in dilute alcoholic solution. The cause of the differences was investigated. At normal application amounts, considerable quantities of randomly dispersed PABA microcrystals exist on the skin surface. The forward scattering spectrum of PABA on skin resembled more closely that of microcrystalline aggregates than that of PABA in solution.