Presence of melanotic stool in terminal ileum. Download Scientific Diagram Your Poop Is Talking .. Are You Listening? Your stool is your gut's daily report card. The shape, color, and texture tell you exactly what's going on inside. Here's a quick doctor style The Quantity of Blood Required to Produce a Tarry Stool. How much? Melena, characterized by black tarry stools, can occur with as little as 50 cc of blood in the stomach. How 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