How do I know what undertones I have?

Check out your veins

If you can see your veins, you may be able to use their color to identify your undertone. For example, if your veins look greenish, then you may have warm undertones. People with blue or purplish-looking veins usually have cooler undertones.

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Do I have warm or cool undertone?

Finding your undertone: The colour of your veins

Take a look at the veins on the inside of your wrist. Do they appear more blue or green? If your veins appear more blue, you’re cool-toned but if you see more green, you’re warm-toned. If you see a fair amount of both both Green and Blue, you have a neutral undertone.