Hi,
I've been letting the grey grown through my hair (I'm about 40% grey) so now its grey, reddish brown and black on the bottom (after years of dying), I'm thinking of using B4 on it but dont want to do anything to the grey colour, just lighten the reddish/brown and black. Anybody know if this'll work?
It looks awful at the moment as the grey is soooo different to the colour on the rest of my head!