It has been found that purple potatoes turn blue when they are cooked, and even emit blue light. So, is this because the chemical ingredients are added to the purple potato? Why does purple potato cooked into blue?
In fact, purple potatoes become blue after cooking, not illegal additions or deterioration in purple potatoes, but purple potatoes are rich in anthocyanins. Anthocyanins appear red when exposed to acidic water, blue when exposed to alkaline water, and purple when exposed to neutral water. Because the tap water is weak and shouting, the purple potato will turn blue after being cooked.
Other foods rich in anthocyanins, such as purple cabbage, purple rice, black mites, etc., will also appear similar. Therefore, the purple potato is cooked and turned blue not because it contains illegally added chemical components.