A mixture of normal stool and melaena (black section of stool in the Download Scientific Diagram Dark Stool Causes: Understanding Color Changes 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 Melanotan 2 Reviews, Clinical Trials, and Safety Dark stool vs black stool the difference can be serious. Dark brown stool is often food or iron related. Black, tarry stool may indicate internal bleeding and needs urgent medical attention. Melanotan 1 (Afamelanotide) Premium Research Peptide