I've had this discussion in years past, and I'm about to get into it again with someone. I don't care if you are going to a costume party as Barack Obama, Mr. T., James Brown, Tina Turner, Oprah or Aunt Jemima. I don't care if you are "just a kid!" I don't care if you "don't mean it that way!" Please do not use dark makeup to make yourself look black(er). No matter what you call it or what you mean, it is not "just a costume!" It's blackface. You can convey your costume perfectly fine without blacking up your skin with makeup, and no costume's supposed "authenticity" is more important than avoiding the incredibly painful implications of and hurt caused by blackface makeup.