Answer
Wiki User
07/02/2014
There are two categories of UV light -- UVA and UVB -- that we consider in terms of sunscreen. UVB causes sunburn, and UVA has more long-term damaging effects on the skin, like premature aging. SPF, or sun protection factor, numbers were introduced in 1962 to measure a sunscreen's effect against UVB rays.
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Asked in Skin Cancer, Skin Care, Medication and Drugs
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boring
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What is the highest number of SPF in sunscreen?
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