“Each time you pull the wand out and dip it back in to lube up the brush head, you’re pushing air into the bottle’s base, feeding the aerobic bacteria that can survive in an oxygenated area,” says dermatologist Dendy Engelman, MD.
“Mascara is the biggest cause of an eye infection; liquid eyeliner is a close second.”Instead, make like an Instagram influencer and swatch those formulas on the inside of your wrist to avoid cross-contamination.
Or better yet: Ask for a sample.
Like clothing stores, sometimes beauty retailers keep secondary testers hidden in drawers, so just ask a sales associate to open a new tester for you.
But the truth is, you’re probably going to have to swipe on a few different shades of red before you find the right one — and when you do, don’t do it straight from the tube.
Scrape (or tissue) off the top and apply it to your wrist with a clean brush.