here is my advice...there is no need to color it back to blonde. Go buy John frieda's sheer blonde shampoo for platinum to champangne blonde hair available at any walmart or cvs. This heavy duty shampoo seriously lightens hair with every use,as it's supposed to bring out blonde highlights. It has lemon juice and stuff in it that lighten. I just colored my hair a dark blonde,when it's usually a sunny blonde and I hated it. the first day of using this shampoo,my hair was lighter.after two weeks it looked like I never dyed it darker at all.Or you could try head and shoulders which kinda strips hair of color as well. Go swimming,and sit in the sun,and it will lighten,I promise! if not,you have my permission to color it back to blonde.