This Green, Color-Changing Blush Oil Reacts to Your Skin's pH — and I'm Mesmerized

The BYO Blush Color Changing Blush Oil contains a chemical reaction in a tube. It claims to be a "universally flattering blush" because it reacts to the natural pH of your skin to give your cheeks a color that's completely unique to you. It's also infused with 20 plant-based oils, including rose hip, avocado, and sunflower, making it a makeup-skin-care hybrid, and is fragrance-free, vegan, and cruelty-free.