The sun-and-skin interactions have controversial sides. Besides important beneficial\neffects, we need to take into consideration also some serious harmful results. In particular, these\nare connected to the portion of the solar spectrum traditionally identified as ultraviolet type A and\nB. The topical application of sunscreens (and the avoidance of extreme exposure to sun rays) is\nworldwide recognized as the best strategy to avoid sunburn and oedema. Moreover, such strategy\ncan efficiently prevent the onset of skin cancer. Therefore, the first aim of sunscreen products is\nto efficiently minimize all damage of sun exposure, while, at the same time, keeping good skin\ntolerability, avoiding safety problems and developing pleasant sensorial properties. Sunscreens, i.e.,\nsubstances able to reflect and/or absorb, at a partial or complete extent, UV radiation are the key\nactors in skin protection. They are used to implement the level of primary photoprotection against\nUV rays. This means that when they absorb the radiation energy, their molecules pass to an excited\nstate and successively re-emit energy in other forms (vibrational, rotational, infrared radiation) to\ncome back to the ground state.
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