The Plantur 39 Colour Blonde products contain powerful pigments. These build up on the hair. The colouring effect intensifies every time you wash your hair and can be washed out gradually with a conventional shampoo. As such, Plantur 39 Colour Blonde products have to be used regularly in order to achieve and maintain the desired colour effect. Leave the products in for 2 to 5 minutes depending on the desired colour intensity. Then rinse out thoroughly.