hi all i am a professional hairdresser i work in a salon and from home and in need a bit of advise. Just booked in a new home client who is happy with her colour and hairdresser but sounds like her hairdresser is hard to get an appointment with so has called me to do her hair. Her hairdresser has given her colour card its a wella tint 12.16 + 40 vol?? i havent used wella for a long time and never use 40 vol on scalp. i asked if that irrated her and she said it does but not enough for it to be a problem and is happy with colour she likes it as light as poss with a tint without using bleach. So my long winded question is (drum roll!) can i use this wella tint and 40 vol on her scalp, do any of u do that? Thank u