Hi I've just returned to hairdressing after a break and need to refresh my knowledge of colouring can anyone recommend a good course also i've got a new client that wants me to tone down her bleach blonde highlights her natural colour is a 7 with a warm tone and she wants l/lights to blend in with her natural but not quiet as dark I was thinking of a 8rb Goldwell (as this is the colours i've been using)but will this be enough red to pre pig as well. Any advice will be much appreciated.