UV light: The rays. Not the heat.
Answered 6/13/2014
4k views
The sun rays: The u.v. rays interact with melanin in the skin causing a chemical reaction to make the melanin darker. The rays also increase the number of melanin cells which then can oxidize and become darker. How cool is that???
Answered 9/28/2016
4k views
4 doctors weighed in across 2 answers
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