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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.
Beets, other red vegetables, cranberries, and red food dyes also can turn the stool color red or maroon. Black Stools (Not Sticky, No Odor). Other causes of black stool are 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.