When iodine solution turns blue black when added to a food?
•
4 min read
The iodine test is a common and straightforward experiment used in food science, with its characteristic color change revealing a specific chemical property. When iodine solution turns blue black when added to a food, it is a definitive indication that starch is present in that food item. This happens because the iodine molecules become trapped within the helical structure of the starch polysaccharide, forming a complex that absorbs light differently, resulting in the dramatic color shift.