12. Hair dyeing needs to be tested first. There are two kinds of hair dyeing, one is to dye black hair into your favorite color for beauty, and the other is to dye premature gray hair into black for beauty, but it is not allowed to carry out Which one, you must be optimistic about the instructions before dyeing your hair, and do it as required. After hair dyeing, do not use alcohol-containing solutions or preparations immediately, and perm should be carried out three months after hair dyeing.