Okay so I just dyed my hair purple black ( it was already dyed black before it was dyed), but the roots only turned, the box said no bleach needed. However, I was thinking of using splat hair color (but sadly did not go for it). I read the back of the box, and it comes with bleach, but do I need to bleach before I use their bleach? Because of my current black I'd assume I would need to wait it out a week or so before dying again. Because I do not want my hair to feel like hay