Hair Dye Shampoo 3 in 1 for Gray Hair Can effectively cover gray hair, so that you are no longer affected by gray hair and rejuvenate. Obtain back the fresh-looking hair of your younger days. Dark Brown/ Black hair can last 3-4 weeks. (WARM REMINDER): please do a skin test before first use. Our hair color shampoo work great, give your greying hair a new lustrous, vibrant, and young look, while replenishing the lost health of weak strands. You can have a natural Dark Brown/ Black hairEffortless. Herbal Ingredients Shampoo Hair Dye for Women Men, Natural plant formula, Polygonum multiflorum can treat the hair, strengthen the hair roots, make the hair strong and soft. Ginseng extract nourish the hair silk, make the hair dark and shiny, deeply nourish the scalp, effectively repair the hair, make the hair Lustrous, soft and smooth. No special skills or tools are required, and it can be used like a normal shampoo, you need to do is apply the color shampoo while your hair is wet like a normal shampoo, leave it on for 15-20 minutes and rinse it out completely. Designed for both women and men, our hair dye shampoo works well on all hair colors, textures, and lengths, allowing everyone to enjoy the benefits of effortless coloring. After dyeing, the hair will be dry, you can use a conditioner to relieve dryness.