Question: what happens if you color your hair twice in one day?
Answer: If you're using dye more than once in a day, you're really over drying your hair. ... Any dye added to hair, even once a week, is harsh on the hair because of the hydrogen peroxide used in the process. It really dries hair out in most cases. If you're using dye more than once in a day, you're really over drying your hair.