Hey so one of my clients is looking at going a bluey grey I've never done any grey before, I've tryed wella 10.0 with a bit of 22.0 on a blonde weft but that was more like slate grey so looking fit people opinions on what I'd best to use. Also do you find it washes out really quickly ? I will attach pic of the clients hair and the pic she has sent me any help would be really appreciated