How Long Is Kosas Revealer Concealer Supposed to Last? Romanowski continues, saying that it would have been better for Kosas to use a robust preservative system that includes methylparaben and propylparaben because they are particularly effective against mold and fungi and can work at a wider pH range. Unfortunately, if this product is not formulated at a pH of below 5.0, then microbes of mold can grow." There's no way to know what pH level the concealer was formulated at, but Romanowski explains that above a pH of 5.0, the preservatives that Kosas formulates with don't work as intended. ![]() "Their preservative includes potassium sorbate, sodium benzoate, and phenethyl alcohol. "They have chosen something which, in my view, is an inferior preservation system," Romanowski explains. ![]() Cosmetic chemist Krupa Koestline also weighed in, explaining that the strength and efficacy of these preservatives are affected by pH and electrolytes, which makes them less effective than some non-clean products on the market which are more stable. What's in the Kosas Revealer Concealer Formula?Īfter taking a look at the formula of the Kosas Revealer Concealer, cosmetic chemist Perry Romanowski tells Allure that the preservatives used in the products aren't the most effective. ![]() While you could chalk all this up to the harsh truth that some products just won't be compatible with everyone's skin, the potential for mold is too concerning to leave unaddressed, so we dug a little deeper.
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