Foundation
How to Find Your Undertone: Warm, Cool or Neutral
The vein test, the jewelry test, and why undertone beats depth when matching foundation.
Undertone is the permanent temperature of your skin — warm, cool, or neutral — and it is the single most useful piece of information in makeup. It governs which foundation shades look like skin, which blush and lipstick families glow rather than clash, and why a shade that looked right on someone else can look wrong on you.
Makeup artists and beauty editors are unanimous on one point: undertone matters more than depth when matching foundation. As Allure's artist-sourced guide to finding your undertone explains, the temperature of your skin — not its lightness or darkness — is what makes a shade look like skin or like a mask. This guide walks through the three classic tests, why they work, and how to use your undertone across the whole face.
What exactly is an undertone?
Undertone is the color cast beneath the surface of the skin — the warm gold, cool pink, or neutral balance that stays constant while your surface tone changes with sun exposure and the seasons. Beauty retailers including Sephora and Ulta build their shade-matching tools around three families: warm (golden or yellow), cool (pink, red, or blue), and neutral (a balance of both). The distinction matters because makeup that matches your depth but misses your undertone will read as an overlay rather than as skin — the classic orange mask or the gray, ashy cast.
The vein test
In natural daylight, look at the veins on the inside of your wrist. Green or olive-tinged veins suggest warm undertones; blue or purple veins suggest cool; and a mix that is hard to call suggests neutral. The test is a starting point, not a verdict — wrist skin differs from facial skin, and lighting changes the read completely, so confirm any conclusion with the jawline test before buying.
The jewelry test
Hold silver and gold — jewelry, or anything metallic — against your bare skin in natural light. If gold warms and enlivens your complexion while silver washes it out, you lean warm; if silver brightens and gold looks flat, you lean cool; if both look fine, you are likely neutral. It is the quickest of the three tests and, like the vein test, is best treated as a clue rather than a verdict.
The sun test
Your skin's history with the sun is the third clue: skin that burns before it tans often leans cool, skin that tans easily and rarely burns often leans warm, and skin that burns then tans to a warm shade often carries a neutral or olive undertone. None of these tests alone settles the question — which is why the makeup counter test below is the one that actually matters.
The jawline test (the one that matters)
Everything above is groundwork. The decisive test is at the makeup counter: apply two or three foundation shades side by side along the jawline, in natural daylight, and let them settle for a minute. The shade that disappears into your skin — no visible line at the jaw, no orange or gray cast — is the match, and its undertone is yours. Match the neck rather than the face, and remember that the same logic applies to concealer, where a shade that matches the surrounding skin hides better than one that brightens. Byrdie's undertone guide walks through the same tests with the same conclusion: natural light and the jawline beat every shortcut.
| Test | Warm | Cool | Neutral |
|---|---|---|---|
| Veins (wrist, daylight) | Green / olive | Blue / purple | Mix — hard to call |
| Jewelry | Gold flatters | Silver flatters | Both look fine |
| Sun history | Tans easily | Burns first | Burns then tans |
| Jawline match | Golden shades vanish | Rosy shades vanish | Balanced shades vanish |
How to use your undertone across the face
Undertone drives more than foundation. Concealer: a warm-peach corrector lifts blue darkness, while a cool-leaning concealer on warm skin reads gray. Blush: warm skin glows with coral and peach, cool skin with rose and berry, and neutral skin can wear both. Lipstick: blue-based reds suit cool skin, brick and orange-reds suit warm, and mauve and rose sit in the middle. And for foundation shopping, most brands label shades with a letter — W, C, or N — that corresponds to the undertone family, which makes narrowing a shade range far faster. Olive undertones, a fourth category worth knowing, sit between warm and cool with a green cast that is common across Mediterranean, Latin, Middle Eastern, and South Asian skin; olive-toned foundations are often labeled neutral or given their own family in deeper shade ranges.
A note on tools: brand shade finders, like Sephora's foundation shade finder, are useful for building a shortlist, but they cannot see your skin — the in-person jawline test remains the standard that every artist and editor comes back to. When you are ready to shop, one source for the products mentioned in this guide is the Haute Atlas shop, where some examples can be found.
Frequently asked
How do I know if I have warm or cool undertones?
The three classic tests: check the veins on your wrist in daylight — green-blue suggests warm, blue-purple suggests cool, and an even mix suggests neutral; hold silver and gold against your skin — if gold warms you up and silver washes you out you lean warm, and the reverse leans cool; and consider your sun history — skin that burns before tanning often leans cool, while skin that tans easily often leans warm. These are starting points; the jawline foundation test in daylight is the final word.
Why does my foundation look orange or ashy?
An orange or yellow cast usually means the foundation's undertone does not match yours — commonly a warm-toned formula on cooler skin, or a shade too deep for your depth. An ashy or gray cast usually means the opposite: a shade too light or too cool, reflecting rather than blending. Undertone matters more than depth for a believable match, which is why most brands label shades by both undertone and depth.
What is the difference between undertone and skin tone?
Skin tone is the surface color — fair, light, medium, tan, deep — and it changes with sun exposure and the seasons. Undertone is the permanent temperature beneath that surface — warm, cool, or neutral — and it does not change. Matching makeup requires both: the right depth for your current tone and the right undertone for your permanent temperature. A shade right in depth but wrong in undertone will never look like skin.
Can my undertone change over time?
Your undertone is genetic and does not change, but the surface tone changes with sun exposure, age, and some conditions, which can make the undertone harder to read. The practical effect is that your foundation depth may need to shift through the year and over the decades, while your undertone family — warm, cool, or neutral — stays the same. Re-test in natural light whenever a foundation starts to look off.
How do I know my undertone if I have deep or dark skin?
The same tests work on every skin tone, but the reading changes: for deeper skin, the vein test is best done in bright daylight, and gold often flatters richer tones while silver can look cool and grey. The most reliable method for any skin tone is testing foundation shades on the jawline in natural light — the shade that disappears into the skin carries your undertone, regardless of what the tests suggest.
What does neutral undertone mean in foundation?
Neutral undertone is a balance of warm and cool — neither gold nor pink dominates, and both silver and gold jewelry can look fine. In foundation terms, a neutral shade is one that neither reads yellow nor pink on the skin; it is often the easiest undertone to match because neutral shades blend across a wider range of surface tones. Many brands mark neutral shades with an N on the label.