If you've ever struggled with finding your correct foundation shade, the process could be made easier just by knowing your undertone. "It helps to identify your undertone in order to harmonize and balance skin tone with the appropriate foundation and concealers," says Martin. "When trying to find the right shades, I like to match from the center of the face down to the middle of the neck, as this will give you the most accurate representation and allow you to see any redness you may want to cancel out."
One of the goals of shade matching is to avoid the dreaded line of demarcation. For Sesnek, one of the most common makeup mistakes he sees are mismatched foundations. "Neutral or cool undertones wearing yellow as well as yellow undertones wearing neutral or cool tones will always show a line of demarcation, make the skin look ashy or gray, and possibly oxidize the formula, making the color look even more unnatural," he says.
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