Do Tannins React with Iron? Understanding the Chemical Complexation
                                
                                
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                                    3 min read                                
                            
                                For centuries, the potent chemical interaction between tannins and iron has been harnessed to create indelible iron gall ink, a testament to this reaction's stability and deep color. But the question, "Do tannins react with iron?", extends far beyond historical writing, impacting everything from industrial rust converters to stubborn stains and dietary health.