Whitening has no season - improve looks

Whitening has no season - improve looks
Sun father-in-law with red cheek, is the old and feeble arch-criminal of the mankind, the ultraviolet ray is that it has much weapons of lethality. There are three kinds of ultraviolet rays: UVA, UVB, UVC. A large number of ultraviolet rays are stopped by the stratospheric ozone layer, they include UVB and UVC, UVA has not been stopped by the ozone layer but reached the earth's surface in a large amount. UVB was considered to be the chief culprit causing sunshine burning and many kinds of skin carcinoma but it was up to the time, latitude in the past. Season, different quantity of reaching the earth's surface above sea level are different too. Recent scientific research and long-time test find especially omnipresent UVA is the only aging factor. So would only prevent suntan until summer, overall and correct beauty should prevent suntan to whiten in four seasons while reading objectively.
Under the normal situation, the clean skin will react under the sunshine when uncovering for 15 minutes. The skin is apt to shine the red person, the one that is spreading the sun-proof product which is marking SPF10 can make the skin protect for 2 and a half hours (namely 15O minute) ,And if adopt SPF20 sun-proof product, can make the skin not shine red or unlikely to sunburn within 5 hours. More important, while choosing to whiten the products, besides seeing SPF SPF value, it depends on it can defend the index of UVA. SPF value is higher, are just directed against SPF of UVB too, can not totally resist the infringement of you of ultraviolet ray.
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