Golden, bronze or caramel hair colors work best for warm skin tones, while cool or neutral hair colors, such ash blonde or cool brown, work best for cool skin tones, according to Allyson Thompson of About.com. Jet black hair coloring is not recommended for those with either skin tone.
Skin color is determined by noticing the effect sun has on the skin. Skin that tans easily is typically categorized as having a warm skin tone, while skin that burns easily is typically categorized as having a cool skin tone. Observing the veins located on the forearms is another way to determine skin tone. Veins that have a green hue typically indicate a warm skin tone, while veins with a blue hue typically indicate a cool skin tone.