How do i dye my hair blonde and blue without it smudging together?

I

i puke rainbows.

New member
I want to dye my whole hair blue, but leave a layer of platinum blonde under my bangs and the sides of my hair by my face. How do I do that without the blue smudging into the blonde every time i wash it? D: HELP.

Like this (except the black would be blonde):
http://25.media.tumblr.com/tumblr_l950igrJ1A1qcc32mo1_500.jpg
 
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