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Silver/Blue Hair Dying Process

So , my hair is a silvery white right now (just got roots done) but i wanted to go a deeper but very silvery blue - my town doesnt have that specific dye so i brought schwarzkopf metallics blue and silver - i have toner as well . I am just wondering , what is the best order or mix of the two in order to get a very toned down almost grey blue ? i am not planning on using a lot of the blue dye but i wanna know if i should put it on first , or ...