Gray Hair Reverse Bar-- Helps the production of melanin in the hair, turning gray hair into black hair. Long-term use can promote hair growth. Suitable for people with premature graying of hair.Restore Hair Color-- Use the new black hair shampoo bar to instantly restore natural hair color, go from gray hair to vibrant brunette, restore confidence, look and feel younger.Natrual -- The gray hair reverse bar is made with natural organic ingredients. The ingredients are mild enough for daily use.Repair Nourishment-- Provide sufficient nutrition for hair, deeply nourish hair and scalp. Magically restores hair and makes it look vibrant and youthful; enhances hair color and maintains its brightness.Easy To Use-- Hair Darkening Shampoo Bar for Gray Hair, Perfect for men and women. Wet hair, apply shampoo soaps directly to wet hair and massage gently into scalp for 2-3 minutes. Just wash off the foam with warm water.