Colour b4 extra hair colour remover is the most convenient and effective way to reverse an undesirable hair colour application b4 extra is ideal for the removal of a build up of hair colour or if the colour you want to remove is dark 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 contains no bleach or ammonia