<p>I understand that ultraviolet radiation (particularly in the medium and short wavelength areas) breaks down the molecular bonds in an organism’s DNA. Does anyone know how this ultraviolet radiation (UVB and UVC) affects the particles/molecules in sunscreens/sunblocks? Or where else might I find more information on that?</p>
<p>Para-aminobenzoic acid, or PABA, filters out uV-B. We hope the ozone filters out most uV-C.</p>
<p>I’m not really sure this board is the best forum for these kinds of questions.</p>
<p>Yes, 99% of the uv radiation that enters our atmosphere is UVA. But I don’t think that ALL sunscreens/sunblocks contain PABA? What about sunscreens that contain oxybenzone and sunblocks that contain titanium dioxide?</p>
<p>Please don’t think I am being dismissive, but I suggest you google it. There are lots of publications written at all levels of sophistication.</p>
<p>I have tried googling. Many hours of googling, in fact. O_O</p>
<p>I have no info on the subject, but I believe you. People just think you’re lazy if you don’t have all the answers stored in your back pocket …</p>
<p>see, the best sunscreens use tit. dioxide and Oxyben. what happens is that tit. dioxide is really just ultra fine titanium diioxide (a substance) powder. It reflects some rays and absorbs the others. Same with Oxyben. Tit, Dioxide is the best sunscreen there is, but since it’s basically powder ina cream, it can clog your pores really bad, and it gives you a washed-out look since the Tit. Dioxide powder int he cream is pure white.</p>
<p>just my 2 cents</p>