Sibol Hair Darkening Shampoo Bar 75gSibol HAIR DARKENING Shampoo Bar, Progressively Darkens and Rejuvenates Hair. All Natural Sibol Hair Darkening Shampoo Bar is made with heritage botanicals, herbs and oils that deeply nourish hair, stimulate new hair growth, and reactivate melanin production to progressively darken hair and minimize greying with regular use. For hair dye users, it prolongs you hair colors grey coverage and maintains the vibrance of your hair color, so you dont have to