Question:
In the rush to get to work on time, I inadvertently left my cosmetic bag in the hot car all afternoon in the heat of the summer. Although everything looks OK, I'm wondering if it's safe to use my makeup now. Should I dispose of it?
Answer:
Official word from the makeup police: If this is your first offense, you’re OK. But if you repeatedly leave your cosmetic bag to fry in the car, you could be in trouble. “Most cosmetic and skin-care items are designed to be stored at room temperature,” says James Hammer, a cosmetic chemist and director of research at Shuster Labs, a consumer products research firm in Canton, Massachusetts. “Turn up the heat, and you can cause physical, chemical, and microbial changes in your products.”
Examples? Liquids such as foundations and cream blushes can dry out, or the water and oil may separate, making the products useless. Also, any vitamins in your liquid products can break down and become less potent. Makeup may develop a strange odor or change color so it doesn’t match your skin tone anymore. “Raising the temperature also encourages the growth of bacteria—particularly in products that you repeatedly dip into like lipstick or mascara,” Hammer adds. There’s an outside chance you could end up with an eye infection, sty, cold sore, or some other skin infection.
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