Is it okay to use nail polish that’s separated?
—Sue- Ellen Steiner, Grand Rapids, Mich. In most cases, yes. Stephanie Bruno of Essie’s productdevelopment team explains that polish separates because the colorants—pigmented particles suspended in the formula—vary in weight. Heavier ones tend to settle at the bottom over time, but rolling the bottle between your hands will remix them sufficiently for use. (If the polish doesn’t reblend or appears crumbly, toss it.) Bruno adds that since exposure to light and heat gradually degrades both color and texture, storing polish in the fridge is your best bet for making it last indefinitely.