Hi my friend has been getting a half head of highlights for some time now and she now has a build up of blonde which she isn't liking. Her natural colour is between a 6 and a 7 and she been using goldwell bleach and is about a 10 now. I was going to scatter in some lowlights to break it up I normally use the goldwell lowlights in a 7 but seen the topchic 7N@BP and wondered what this was like and if I'd need to pre pig before hand. Been out of hairdressing a while after having a breakdown and need some help.