This topic doesn't seem to be talked about on the internet. I heard that if you use blue hair dye on dark, unbleached hair, it will turn it black with a a blue tint reflection. I gave it some thought, and decided black/blue reflection would make an excellent style! but what are the advantages and disadvantages of doing this?I heard the color fades quickly. I have pale complexion. And my hair is long, thick, wavy, and dark brown if that is any help. 
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