Often foundations and concealers prompt you to choose a shade based on your undertone, especially when shopping online. But if you don’t know what your undertone is, that isn’t much help! Foundations usually come recommended for one of three undertone types: “cool,” “neutral,” or “warm.” It’s possible, though, to fall somewhere in between (you could be “neutral-warm,” for instance). To get you closer to finding the perfect match, we asked Greenberg to outline how to figure out your undertone. Note, these same principles apply on all skin tones, from very fair to dark. And remember, if you’re having trouble DIY’ing it, you can always ask a professional makeup artist for a skin analysis. Those with cool undertones will notice their skin has a pink, red, or blue tinge to it. You have a “cool” undertone if: • If the veins on your wrist are blue or purple • If silver jewelry flatters your skin more than gold • When you look at your skin in the sun, it appears blue-ish If you have neutral undertones, your skin is neither pink/red/blue nor yellow/gold/peach, but somewhere in between. You have a “neutral” undertone if: • The veins on your wrist are blue-green • Both gold and silver jewelry flatter your skin • When you look at your skin in the sun, it appears greenish Those with warm undertones will notice their skin has a yellow, gold, or peach tinge to it. You have a “warm” undertone if: • The veins on your wrist are slightly green or olive • Gold jewelry flatters your skin more than silver • When you look at your skin in the sun, it appears yellowish Three More Tips for Finding the Right Foundation So now you know your undertone, you can start to narrow the field. If you’re trying foundations in a store, here are Greenberg’s three tips to help you find the right one. 1: Prep Skin First Before you do anything, exfoliate and moisturize your skin. “Slough off those dead skin cells and prepare that canvas so it can honestly accept color,” says Greenberg. “If your skin is sweaty or isn’t totally clean, the color won’t be accurate!” 2: Test in Good Lighting Make sure you test your foundation in good lighting. It’s always a good idea to first test it out in one location, and then go somewhere else with different lighting to see if it still matches. And make sure you’re wearing white, as other colors might alter your tone. Greenberg warns that you should never try to correct your color with a base. “It’s best to match your undertone, and then if you feel pale, you can always add bronzer or blush for dimension,” she says. 3: Match The Color You See Most There are three parts of the body you have to think about: the face, the neck, and the décolletage—and Greenberg points out that all of these can differ. “The most natural thing would be to match your neck, but because of sun exposure and elements, the face/décolletage are often darker than your neck,” she says. To even things out, Greenberg suggests choosing a product that matches the color you see the most, and then applying base to the face and neck so that you get even color all over. Via Related PostsHow to: Katy Perry’s Nail Polish in Dark HorseDIY: Space Saving Makeup Battle StationBlue Gradient Eyeliner Tutorial (Coastal Scents 88 Palette)DIY Mani Tutorial: Orange Slices Deborah Lippmann Sweet Dreams Swatches & ReviewWhy Most Beauty Bloggers Fail