Not sure if you have a warm, cool, or neutral undertone? Find your undertone at home using the vein test, then swatch foundation along your cheek, jawline, and neck for a more accurate shade match. We’ll also show why foundation can look different on your hand or appear more orange after wear. How to Find Your Undertone at Home. Vein Test: Look at the veins on your wrist to help determine whether your undertone leans warm, cool, or neutral. Where to Swatch: Test foundation along your cheek, jawline, and neck rather than relying only on a hand swatch. Find Your Foundation Match: Compare how foundation looks on your face versus your hand, since your skin tone can vary across different areas. Watch for Oxidation: Some foundations can change slightly or appear more orange after wear. Give your foundation time to settle before deciding whether the shade is your best match. Featured Products: Rare Beauty True to Myself Natural Matte Longwear Foundation NARS Longwear Matte Foundation...