![]() Ahead, find out how to tell when it's time to toss that favorite face powder, blush, mascara, nail polish, and more right out of your makeup kit. "It is an indication of how many months a product may be used without preservation, physical, and/or chemical degradation, which would lead to micro-organism contamination, decrease in efficacy, or harm to the consumer."ĭifferent types of makeup products, like different types of hair products, can "age" differently, so we spoke to the experts to learn how to tell what's still good and what's past its prime. "PAO, indicated by an open-jar symbol, was first was adopted by the EU commission in 2003 and quickly became best practice throughout the cosmetic industry," explains Athena Teschendorf, the development and regulatory affairs manager for SOS Beauty. ![]() ![]() More, however, feature a symbol that reflects the PAO or period after opening. So what's your first course of action? Check for an expiration date on the label - some, though not many, products include this. Since most of us are not cosmetic chemists, we can't be expected to be able to easily identify those preservatives. "A good preservative is broad-spectrum, which means it acts against bacteria and yeast, as well as mold." "Preservative systems are extremely important to make sure a product is safe for use," explains cosmetic chemist Krupa Koestline. So how do you know if your makeup has expired? Much of what makes or breaks the longevity of a makeup product boils down to preservatives.
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