Hi geeks, I have got a client and she has very very resistant greys. I use Schwarzkopf igora and used the stronger -00base. The colour covered perfectly, but today I have had a Msge from her saying the colour has disappeared. It's been exactly two weeks since I did her a global colour. I'm convinced it is regrowth but not 100% sure. How much regrowth would you expect to see after 2 weeks? Any help or advice wud be great. Thanks xx