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Why is the purple sweet potato bought at home white?

Sweet potato is also known as sweet potato, sweet potato, sweet potato, sweet potato, sweet potato, sweet potato, sweet potato, sweet potato, sweet potato and pillow potato. Common perennial dicotyledonous plants, herbs, with slender vines and creeping stems. Root tuber, which produces lactic acid by anaerobic respiration, has white or red skin color, and the meat is mostly yellow-white, but it also has purple. Besides being used for food, it can also be used to make sugar, wine and alcohol.

sweet potato has many forms, such as red flesh, white flesh, white flesh, yellow soil, red flesh, purple flesh and so on. One reason why the purple sweet potatoes you bought at home are white is that they are white, and another reason is that if you can't eat them, they are bad potatoes caused by nematode disease, so throw them away!