Hi Scott, i've been dying my hair a dark brown for quite a while now, my hair naturally is a dirty blonde colour, i started growing my roots out but got to frustrated so dyed my hair blonde, the roots are annoying a lot blonder while the rest of my hair remains a lighter brown, i was going to use B4 to strip the colour back, what colour would it go? Would it have any effect of the blonde roots? i know B4 doesnt work on bleached hair but what about a blonde dye?
Thanks,
Sophie