2. No matter what brand of hair dye, you should do an allergy test before dyeing.
3. Apply a small amount of hair dye cream behind the ear or on the arm. After 24 hours, you can use it if you are not allergic.
4. Then, you should master the correct order of dyeing your hair.
5, and don't perm immediately after dyeing your hair, it is best to interval one or two months.
6. Finally, you must make up the dye regularly to keep your hair in the best condition.