I would use a base 7 with 8.5vol (2.55%) mixed 1:1 . . 8/73 is a lovely colour
I have covered grey very succesfully by using this mix: 3/4tube 7/0 1/4tube 8/73 with 3 inches of 0/22 violet mixtone. Mix with 65ml activator. Allow to process without heat for 40-45 minutes
Let me know how you get on xx
Scottydolly, I'm doing this today minus the viol mix tone as worked out too expensive for one client .... I tested the hair with just 7.0 it wasn't a fab grey coverage but it blended As just quite dark, so went and bought the 8/73 hopefully that will lighten up a bit and give more coverage thanks for the advise and I will let u know ow I get on later... Also would u advise go straight on roots to ends ( ends are coloured well highlighted with bleach 6.8 and 10.03 ) I'm flooding this tigi in between foils on half head .... Wld ur suggest putting on roots first then ends so they don't go to dark? Her hair is quite porous x