Black Hair Dye Shampoo for Gray Coverage - Hair Color Shampoo for Men&Women.Black.

Washing and conditioning tips： You can use the coloring shampoo on dry and wet hair, it is recommended that you use it on wet for better results. Please choose the right amount according to your hair volume. If your hair is very thick, it is recommended that the shampoo can stay on your hair for 1-2 minutes more to have a better coloring effect. Warning： Please conduct allergy test in advance: apply the shampoo behind the ear. 24 hours without adverse reaction can be used without worry.