The vein test for undertone

Look at the veins inside your wrist: blue or purple usually means a cool undertone, green means warm, a mix means neutral. It's the most quoted undertone test there is — and the easiest to get wrong.

How to do it right

1. Use natural daylight — stand near a window. Indoor bulbs tint everything.
2. Look at the inside of your wrist or forearm, where veins sit closest to the surface.
3. Clean, makeup-free skin. Don't press — pressure changes the color you see.

What the colors mean

• Blue or purple veins — cool undertone.
• Green or olive-green veins — warm undertone.
• Blue-green mix, or genuinely hard to tell — neutral undertone.
• Teal veins with muted-looking skin — often olive, which plays by its own rules.

Three ways the vein test lies

1. Wrong light. Warm indoor bulbs make everyone's veins look greener than they are. If you only checked under bathroom lighting, check again by a window.
2. Extreme skin depth. On very fair skin, veins almost always look blue regardless of undertone. On very deep skin, veins can be hard to see at all. The test was designed for light-to-medium skin and it shows.
3. You're reading redness, not veins. Flush, rosacea or irritation near the wrist area contaminates the read. Veins only.

When to ignore your veins

If any of the above applies to you, skip this test without guilt and use the jewelry test and fabric test instead — both outperform veins for most people. The full ranking of every test is in the undertone guide.

Questions women ask