Hi wondered if anyone can me some advice please.. I have a lady who currently has highlights and few low lights she wants to go for a full head tint, she is quite grey round the front but wants a a nice warm brown colour. Not to dark.. she's picked out 7.3 in L'Oréal maj. im just wary as to wether this will give her the complete coverage over the grey.. and the highlights she she already has.. inwas going to add some base 7 also but worried it might go a bit khaki looking.. does anyone have any suggestions?