What Causes Black or Tarry Stool? I'm so sorry to post a poop picbut this looks black and I'm wondering if I should be concerned. : r AskDocs Stool Colors and What They Can Tell You Your stool color can carry important clues about digestion, diet, or even disease. Most shades are harmless, but some changes signal the need for A mixture of normal stool and melaena (black section of stool in the Download Scientific Diagram There are no 50 shades of melena, only one color: Black; and it's a color that smells bad. Otherwise it's not melena or it's derivatives (melenic, melanotic, melenatonic ) Great thread w a When is stool color concerning?