Directions Semi Permanent conditioning hair colour hair colour lasts between approx 4-12 washes.It contains no bleaching agents so is therefore not suitable for colouring dark hair. Pre lighten dark hair with one of our Stargazer bleach kits. The colours in the shade chart are given only as a rough guide as colours appear different on screen to on the hair itself. The end colour result will be more vibrant the lighter the base of the hair it's applied to. Directions colours are all compatible and can be mixed to create limitless custom shades.