So I only got my bangs blue, but what I did was basically bleached out my dyed black bangs for 2 hours at night, bleached it again for an hour in the morning, and then again for a half hour until it was bleach blonde. Then I deep conditioned it for a few hours, let it sit overnight, and the next day I put in blue Raw dye for an hour and it was perfect.
However, I have ONE warning for everyone about Raw dye: It stayed really well in my hair and lasted, but it’s metallic, and so the blue dye will be extremely hard to get out. I still have traces of blue in the tips of my bangs that I have to redye all the time, so if you can find a non-metallic blue dye, I suggest using that one.

