MOKERU Ginger Hair Black Shampoo for Men and Women Fast Hair Blackening Natural Professional re black Hair Dye Shampoo. It releases the pigment when the shampoo is massaged into the hair, delivering permanent gray reduction — that is to say, it will stay colored as long as you continue to use it. New coloring black hair, you won’t use any coloring chemicals which contain ammonia that can harm your hair. NOTE : NOT RECOMMENDED FOR SENSITIVE SKIN.IF YOU HAVE ANY ALLERGIC PROBLEM DONT USE WITHOUT ANY DOCTOR CONSULTATION.