What a horrible decision. If it's really rose/pink-ish, it makes zero sense. White would've been the far better choice and could've been a nice pun to his name (black/white).
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It's probably just me, but this haircolour takes away a lot of my interest from this character. A character that is supposed to be dark and threatening should get a different colour. I wouldn't even mind if his hair got a rose/pinkish-ish shine whenever Black uses his black/purple aura, similar to how Goku got white hair when he combined SS Blue and Kaioken x10 against Hit.