The sweet potato is a popular ingredient in many classic, cool-weather recipes. In most cases, sweet potatoes go bad because of the natural aging process. For example, the discoloration of the skin is a good sign that a potato is running out of time. For our Best Baked Sweet Potatoes, we recommend passing on tan- or purple-skinned sweet potatoes (so-called dry varieties) and sticking with red or orange, which are known as “moist” varieties.These contain more of the enzyme amylase, which breaks down starches into sugars. Sources: For details about data sources used for food storage information, please click here. Just remember to eat the peel too. They will begin to get soft and wet (water will leak out) and then turn brown and/or black. Purple sweet potatoes have a … [Photograph: Shutterstock] It's not always easy to tell varieties of orange sweet potatoes apart. We've had some sweet potatoes siting around on the counter for a while. Sweet potatoes fit into almost any way of eating, no matter which diet you choose. The flesh has some yellow parts on in in addition to the usual beige/off white color, and the skin on one looks like it has like thick veins inside it. Sweet potatoes with purple flesh are from the same family as regular sweet potatoes. How To Prevent Sweet Potatoes Going Bad. They are sometimes marketed under the names Stokes Purple and Okinawan potatoes. The thing that sets purple sweet potatoes apart when it comes to their nutritional value is that they are packed with antioxidants. It is well known that sweet potatoes are rich in vitamins, minerals, and fiber and have good nutritional value. Throw it out. You should store your raw sweet potatoes in a cool dark place, like the pantry.Try to avoid keeping them in hot areas, as temperatures that are too hot will cause tiny hole to form inside the potatoes.. Sweet potatoes will last for around two weeks stored like this, or up to one month if them temperature is lower than room temperature. Purple sweet potatoes are lavender-colored on the inside and outside. If it is, you can still mix the potato with the rest of the ingredients. In the end, you can store cooked sweet potatoes in the fridge for 3 to 5 days or put them into the freezer if you want to keep them for long. But sweet potatoes with cuts, gouges, bruises and blemishes have already started going bad. How To Tell If Sweet Potatoes Are Bad? You can cut out the bruised parts and cube the rest for roasted side dishes , but they’re not a candidate for any recipe that calls for a whole baked sweet potato. Some common traits of bad sweet potatoes are discoloration and growths through the skin. I started to cut them up to roast but not sure if they're too old. 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