What Color Should Liquid Be After Colonoscopy Prep. Your stool should be clear, yellow, light and liquid. If your stool is not clear after taking your entire bowel prep agent, you may need additional prep agent.
The presence of dark particles or thick brown or black stool means you are not ready for colonoscopy. Some brands come in powder form and should be mixed in with water before they are digested. Preparing for your colonoscopy helpful hints….