What Your Poop Color Reveals About Your Health What should a GOOD bowel prep look like? , This is a common concern from patients coming in for their colonoscopy. Is the prep good enough? If you can see through the liquid, and there are no Emerging Threat: Melanotan, Repackaging, and Online Sales This is melanosis colia result of long term stimulant laxative use (like Senekot). Have you ever heard of melanosis coli? It's not just staining. It's your colon screaming for help. Senekot (a PDF) Pseudoobstruction with pitch black colon A very rare Presentation of Melanosis Coli