If the veins on the wrist appear blue or purple, the person is cool-toned; if the veins are more green, she is warm-toned. Once the determination has been made, it is easy to figure out what season fits a particular skin tone.
Knowing the correct skin tone can assist with choosing makeup and clothing. Those with a cool skin tone and dark hair are likely winters. Springs have light hair and warm skin tones. If both the skin tone and hair are light, the person is likely a summer. Falls tend to have warm skin tones and hair that ranges from black to red.