Once you know your undertone, narrow your choices to three shades that appear closest to your jawline. Never test foundation on your arm, as that skin is often darker or more freckled than your face. Swipe the three shades in parallel lines from your lower cheek down to your neck. The correct shade is the one that "disappears" into both your face and neck. This ensures you won't have a visible line at your chin.
The first step is identifying your undertone, which never changes, regardless of sun exposure. Look at the veins on your inside wrist. If they appear blue or purple, you likely have a cool undertone and should look for "C" or "Pink" labeled shades. If they look green, you have a warm undertone and should seek "W" or "Yellow/Golden" bottles. If you see both or can’t quite tell, you are neutral and should reach for "N" shades. Another trick is the jewelry test: if silver looks better, you’re cool; if gold pops, you’re warm. how to buy foundation color
Buying the perfect foundation requires a blend of science, lighting, and patience. Most people make the mistake of testing shades on their wrists or under harsh store lights, leading to a mismatched "mask" effect. To find your true second skin, you must evaluate your skin from the inside out. Once you know your undertone, narrow your choices