Purple sweet potatoes contain a large amount of anthocyanins, and the outer skin and cooked meat are purple. If the outer skin of purple potatoes is black, brown, or has black spots, it may be moldy or spoiled. Purple potatoes, like potatoes and sweet potatoes, have no obvious smell, while spoiled purple potatoes may emit a rotten or moldy smell, which is easier to distinguish.

What does purple sweet potato look like when it goes bad? Generally speaking, fresh purple sweet potato can be stored for 10 to 20 days. If it is well preserved, it can be stored for a longer period of time. However, cooked purple sweet potatoes can only be stored for 2 to 3 days at room temperature. Long-term storage will affect the taste and deteriorate. Purple sweet potato is suitable for storage at 4~6°C, so refrigeration is a better choice. Wrap the purple sweet potato with plastic wrap and put it in the refrigerator box. It can be stored for about 1 month, but be careful to use bags. Good to avoid odor mixing with other foods. After the purple sweet potato rots, the nutrients inside are destroyed, the taste is poor, and more bacteria and microorganisms can breed. Eating this kind of purple sweet potato can easily cause gastrointestinal discomfort, and the moldy purple sweet potato is toxic. Excessive consumption can lead to poisoning. .