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Sunblock (also commonly known as sun screen, sun tan lotion, sun cream or block out) is a lotion, spray, gel or other topical product that absorbs or reflects some of the sun's ultraviolet (UV) radiation on the skin exposed to sunlight and thus helps protect against sunburn. Skin lightening products have sunscreen to protect lightened skin because light skin is more susceptible to sun damage than darker skin, a number of sunscreens have tanning power to help the skin to darken or tan.

The first effective sunscreen may have been developed by chemist Franz Greiter in 1938. The product, called Gletscher Crème(Glacier Cream), subsequently became the basis for the company Piz Buin (named in honor of the place Greiter allegedly obtained the sunburn that inspired his concoction), which is still today a marketer of sunscreen products. It has been estimated that Gletscher Crème had a sun protection factor of 2.

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