RECIPE FOR BLONDE HAIR WITH HIGHLIGHTS
Matrix Vlight bleach for highlights mixed with 20% vol. peroxide and Socolor N8 for lowlights mixed with 20% vol. peroxide.
The technique is in the foiling placements, the amount of hair wolves to bleach, and the watchful eye of how long to let the bleach lighten the hair.
Do not try this at home, only leave your hair in the hands of a trained professional.
Just offering a little of my experience and knowledge.