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Your hair needs to be bleached as light as possible- any yellow will go green when mixed with blue, as you've already noted. If you're using a dark blue, it might work to just go over it again, but if it's lighter than you will have to strip out as much of the yellow as possible. Keep in mind when bleaching that the hair will always look lighter when covered with product- to get a true idea of the level of lightness you need to wipe off a test section completely, then reapply bleach if it's not light enough. What kind of color is the blue- semi, demi or permanent?
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