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今天看着家里的几瓶以前买的opi 几乎都是满的 有些根本没用过 在把他们都扔到垃圾桶之前突然想搞明白如何判断指甲油变质过期这个问题
万能的谷歌大神给出了如下答案:
http://sugarmedic88.blogspot.com ... -polish-expire.html
"Hi Samantha
The Period-After-Opening number is required for most cosmetics by the European Union (EU), but it is rather meaningless for nail lacquer. Nail lacquer does not go "bad" with bacteria after opening (or ever), because the solvents are chemically hostile to microbes. Indeed, research shows clearly that microbes don't survive in nail lacquer, whether in a salon environment or even if deliberately contaminated in a laboratory test.
For most other cosmetic products, such as skin lotions or hand creams, the preservatives eventually get used up, especially with repeated opening and closing , and bacteria can then colonize them and start to grow. So the PAO makes sense for these products. I don't think they had nail polish in mind when they wrote the rule.
So.....Why 24 months PAO for nail lacquer? Because the EU is distrustful of larger numbers. In reality, nail lacquer should stay safe forever. It might not be any good after many years -- due to slow color changes or if it evaporates to a solid, useless block -- but it won't be unsafe. And as you know, the PAO number is about how long, after opening, is the product SAFE ("no harm to the consumer"), not about whether it will work properly!
Is this what you wanted to know?
Paul Bryson, Ph.D.
Director of Research & Development, OPI Products Inc., www.opi.com |
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