What Color is Heme Iron and How Oxygen Determines Its Shade?
                                
                                
                                •
                                
                                
                        
                                    
                                    2 min read                                
                            
                                The color of heme iron is a dynamic indicator of its oxygenation status, shifting from a bright scarlet when oxygenated to a deep purplish-red when deoxygenated. This chemical property is fundamental to the life-sustaining function of blood, dictating its shade throughout the body's circulatory system.