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Taking your basic ol' Halloween costume from mediocre to spooky-as-heck is as simple as putting on black lipstick. The onyx colour adds a sinister (yet trendy) touch to any costume. Want to give your mermaid makeup a hint of gore? Black lipstick will do the trick. Or add some atop your Disney villain look to make it grunge. Ahead, we've rounded up some of our favourite black formulas so you can get to planning your costume.