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Green: 1  Green stools are always normal, but they can be mistaken for black stools. 2  Bile. Most dark green stools are caused by bile. 3  Green stools are more common in formula fed than breastfed infants. It can be normal with both.  Green stools are more common with diarrhea. This is due to a fast transit time through the gut.
Black Stools (Not Sticky, No Odor) Causes of black stool include iron pills or bismuth-containing medications (such as, bismuth subsalicylate or Pepto-Bismol). If the stool color is dark because of any of these medications, it is typically not sticky in texture and is not foul-smelling. Black Tarry, Sticky Stools. Bleeding in the stomach (from gastritis or an ulcer) or the intestines can change the color of stool. If bleeding occurs in the stomach or the upper part of the small intestine, the stool may turn black and sticky, and be described medically as black, tarry stool (melena).