The Economic Times

Sweet corn can turn dark after home canning even when it was processed correctly; natural compounds can react with iron and air to create the unexpected colour

Sweet corn may develop brown or black hues after home canning due to chemical reactions. These color changes often occur without spoilage, despite proper canning practices. The reactions involve enzymes and minerals, which can influence the corn's appearance. High-quality water and appropriate processing temperatures are crucial for maintaining color. It is important to evaluate the safety of canned corn based on established safety guidelines, not color changes.