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[請益] 防曬劑的原理
Jun 1st 2014, 14:12, by iamvegetable

作者iamvegetable (蔬菜人)

看板BeautySalon

標題[請益] 防曬劑的原理

時間Sun Jun 1 14:12:38 2014

一直有一個疑惑, 就是防曬劑的功用,是根據時間還是曝曬程度遞減呢? 如果在不流汗出油,防曬劑沒掉的前提下,會是: 1.一定用量的防曬劑吸收定量的紫外線, 例如10元硬幣用量吸收x量紫外線,吸完要再補擦 沒曬到就可以不用補 還是 2.一定用量防曬劑只能在一段時間內起作用, 例如早上8點擦,就算中間沒曬到太陽, 3.4個小時後還是要補? (不過這個假設有點爭議@@a 因為沒曬到太陽還是會有紫外線) 雖然看了一些有關防曬係數的文章, 但還是一知半解, 請問究竟哪一個認知才是對的呢?謝謝 -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 36.236.156.161 ※ 文章網址: http://www.ptt.cc/bbs/BeautySalon/M.1401603161.A.618.html

amy86422000:有分物理和化學性,化學性有些照光一 61.228.22.26 06/01 14:40

amy86422000:段時間會光分解。還有流汗出油下水等 61.228.22.26 06/01 14:40

amy86422000:因素。 61.228.22.26 06/01 14:40

amy86422000:總之在陽光下曝曬建議一段時間後就要 61.228.22.26 06/01 14:44

amy86422000:補擦,因為不流汗不出油很難達成 61.228.22.26 06/01 14:44

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