i suppose just doing it overtop would be ok, leaving it on longer won’t really do much though, the formula only works for an hour anyway. you might actually have to go darker to cover it up, depending on what tone the blue is. maybe was your hair a few times to get any excess blue dye out before dying it again.
did you try anything yet, how did it go?posted about 4 years ago
I love natural hair colors..! I use to dye mine but not anymore.
:) what did you do finally?