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It is said that having water or oil on the skin increases tan. Is it true? If so, is it due to magnifying glass properties of the water and oil droplets (but that might not be the only mechanism, as covering one's skin with oil does not produce droplets), or to the sensation of heat that is different and might allow longer sun exposure?

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closed as primarily opinion-based by Bez, Devashish Das, WYSIWYG, Chris, Armatus Aug 20 at 12:06

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.

Skeptics better suits for this question. –  Devashish Das Aug 19 at 19:20

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