A tan is the skins natural protection. Sunbeds omit UV A and UV B .When UV A enters the skin the melanin already there reacts with the oxygen in the blood and turns brown. When UV B enters the skin it reaches the lower layers of the epidermis where the melanocytes are and "excites" them into producing melanin.
The melanin produced from this will be distributed throughout the skin over the next 2-3 days. (that's why you should only tan once every 48 hours!).The next time you go in a sunbed this melanin that has been produced will turn brown from the UV A exposure.
Saturday, March 7, 2009
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