Colour b4 regular for all hair colours is a hair colour remover which is the most convenient and effective way to reverse an undesirable hair colour application b4 regular is ideal for the removal of a fresh colour application or an unwanted shade or tone colour b4 shrinks the aritifical dye molecules in the hair enabling you to simply wash them away colour b4 does not touch your natual hair pigment so you are left with the colour which lay beneath your artifical shade colour b4 contain