Hi my friends daughter has asked if I could colour her hair. She has base shade of 6 which is virgin but wants to part her hair down the middle and have half her natural colour and the other half koleston 12/81. I haven’t done colour for quite some time as I now only cut so a bit rusty. I have ordered some wella blondor. Just wanted some tip on applying the bleach to lift it and then to apply the colour afterwards. I was thinking on doing the pre lightening using foils to gain more control. Using 3% at the back of the head moving up to 6% on top. For applying the tint should I use a peroxide 3% or a pastel? We are aiming for something like the photo.