![]() ![]() "You'll know it's gone bad because the color will start to shift," cosmetic chemist Ni'Kita Wilson has told Allure. This is meant to cover blemishes, not cause them - which is what can happen if you use a concealer that's too old. "Separation can make the preservative system less effective and therefore make the product prone to contamination." Concealer "Separation can be seen as an oil layer forming on top, color not distributed correctly throughout the product, or a water layer forming on the bottom," says Koestline. ![]() Another sign of a liquid or creamy foundation (or concealer or blush) being past its prime: separation. ![]() Switch mascara every three months to be safe, and absolutely do not use the same one for longer than six months.Īn off smell or a change in color tells you the formula is finished - applying it could cause irritation or breakouts. Teschendorf concurs, telling Allure, "This product form has one of the shortest PAOs due to its high potential to get directly into the eyes and cause serious infection." Lingering bacteria can cause redness and itchiness, or even conjunctivitis (pinkeye) and sties. Mascara is the makeup item you should be most vigilant about: As the brush is taken out, applied, and put back in the tube, it brings with it any bacteria that has collected along the way, explains cosmetic chemist Jim Hammer.
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