After a brief review of the literature, the results of exposure of the skin to long wave ultraviolet irradiation are detailed. Immediate pigmentation (IP) can be produced in all but very fair-skinned individuals. Even in the latter, with negative IP at first, a positive result can often be produced on areas which have become pigmented by the enzymatic process. Repeated doses of IP result in longer duration of the pigmentation, which may vary in duration from an hour to many months. The findings of Pathak et al 12 were confirmed as regards the capacity of visible light to produce IP. No repigmentation was observed in these areas at the end of 24 to 120 hours. The mechanism of tanning of the skin is briefly discussed.
MONASH S. Immediate Pigmentation in Sunlight and Artificial Light. Arch Dermatol. 1963;87(6):686–690. doi:10.1001/archderm.1963.01590180014002
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