I'm a ash brown and want to colour about 10% of the hair to grey

Has anyone did this and if so what is the way to do it?

Thanks

I highly doubt there is a way to do this. Toplace uses synthetic hair for their grey hair. I think you best bet would be to have the piece sent back to the factory and have grey added to it.

Extremely difficult, extremely damaging and extremely temporary on bio hair. impossible on a piece.