Smart Hair Darkening Shampoo is an easy to use product to colour your hair Natural Black / Natural Brown. With Natural Plant Keratin and 90% herbal ingredients it is one of the mildest and safest product created for turning your dull grey or white hair to Natural Dark Brown colour without staining the scalp and skin. Use it like ordinary shampoo and leave on hair for 20 minutes. The shampoo turns your hair Black / Brown while it gently cleanses and replenishes essential oils in the hair. The rich sandalwood fragrance of the shampoo and conditioner will provide deep relaxation for your hair roots.