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I've allways wondered how sunscreen protect you? I'm guessing it "takes the hit" for your skin somehow, but how does it actually work?
Also is it true you can use lower protections once you've started to get a tan? The general idea beeing your skin is somehow "stronger" or more well protected on it's own when it's been exposed to the sun for a while.... ? 
Most sunscreens absorb UV rather than reflecting it. The enegery is degraded to heat.
Quote from: Bored chemist on 24/05/2009 20:46:37Most sunscreens absorb UV rather than reflecting it. The enegery is degraded to heat.That is interesting. Would that mean I am getting hotter if I put on this kind of sun screen? In a noticeable way?