For this type of dye I do not think you would need to since it is black. However, if you want more of a blue effect you would probably need to bleach it or at least lighten it. I haven't used this color but used the deep velvet violet and it has a subtle shine to it, due to having prior dyed black hair. The box has three items, concerning dye: the developer, a tube of the hair color, and a tube of conditioner that is supposed to last 8 weeks (if used once a week). There are also gloves which are actually smaller and regular rubber which made them easier to use.