5. Apply color to unwashed hair
Hair colors have chemicals that could cause a tingly sensation when applied to a very clean scalp. Likewise, small scratches on your scalp caused by your fingernails when you washed your hair will definitely sting, which could also cause allergic reactions. Wash your hair a day before you are scheduled to color your hair. This will give your scalp the time to produce natural oils to protect your scalp. It is also all right to apply hair color even if you have used mousse or other hairstyling products the day before.