Had myself a keratin straightening treatment about 3 weeks ago to get rid of dodgy 80's perm disaster.
It's fab, I love it and my hair is now in the best ever condition it's ever been.
I've been using SLS free products but now the grey is coming through and mr previous colour has faded.
I've googled but no joy and wondered if anyone has any idea? I'm guessing herbal / henna might be the way to go?
TIA