Take a look at the colour of the veins beneath your skin, on the under side of your wrist. If they appear blue you have a cool skin tone. If they appear green you have a warm skin tone. If they are bluey/green you are in the mixed category.
Alternatively hold a piece of white paper next to your face and look in the mirror. If you notice pink/blue tones in your skin you are in the cool category. If you notice yellow/golden tones in your skin you are in the warm category. If you notice a mixture you are in the mixed category. Remember just because you have an olive or dark skin colour this doesn't necessarily mean you have a warm skin tone and if you have a fair or beige skin colour your skin tone is not automatically cool.
Use our find your phenotype tool on the Makeuptagg iPhone app for a more accurate conclusion.