Presence of melanotic stool in terminal ileum. Download Scientific Diagram Retroflexions.com The Rectal Bleeding Rainbow Why is my poop green? Stool colors explained What does your poop colour indicate? Pay attention. There's a lot to be learned by the colour and consistency of your stools, as well as the frequency and how easily passed Hematochezia vs. melena: What's the difference? UT MD Anderson