black nail polish tends to look a little goth or tacky, and it can make your skin tone look gross.
if you really want to use something dark, try a deep brown, it's less harsh. i use o.p.i.'s 'espresso your style.'
as for red, as long as you use a good, bright shade that isn't too bluish, it looks great. i'd recommend orly's 'haute red.'
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