This thick natural look formula is easy to shampoo-in. It won't wash out, no matter how often you shampoo. Just For Men Hair Colourant lasts until your grey grows back.READ AND FOLLOW DIRECTIONS ON ENCLOSED LEAFLET.Do not use this product at all if you have skin depigmentation problems such as white patches on your skin (a condition called vitiligo) or if you have a family history of skin depigmentation problems, as an allergic reaction may cause temporary or permanent loss of skin pigment.This product contains ingredients which may cause skin irritation to certain individuals. Contains phenylenediamines. A preliminary test according to accompanying directions should be made before use. This product must not be used for dyeing eyelashes or eyebrows - to do so may be injurious to the eye. Avoid contact with eyes. Rinse immediately with water, if product comes into contact with eyes. In case of a reaction, or when in doubt, consult a doctor before using any haircolour product.