
Potatoes are in most kitchens, but like all fresh produce, they do go bad. Potatoes can be stored for quite a while in a cool, dry place; it is not advisable to let them out over an extended period. Discoloration, soft spots, or sprouting is an indication that the potatoes have spoiled. Check the purity and quality of potatoes by the next four steps.
Check texture
Fresh potatoes should be firm to the touch. If it has soft spots or wrinkles, the potato is beginning to go bad. While a few small wrinkles may not necessarily mean the potato is bad, too much softness could mean that the potato is past its prime and might not taste as good.

Look for sprouts
If stored for too long or in a place that is too warm, potatoes can start to sprout. Small sprouts are not bad but should be trimmed off prior to use. However, if the potato has large thick sprouts it is probably best discarded as the potato may have lost much of its nutritional content and flavor.
Check for discoloration
Healthy potatoes will also be of even color, with no green areas or blemishes. Greening is usually an indication of the toxic compound solanine that develops when potatoes are exposed to light. If you do notice any greenish patches, it’s best to cut these areas away before using the potato; if the whole potato has turned green, get rid of it.
Smell the potato
A fresh potato has a neutral, earthy smell. If the potato has a sour or musty odor, it may have started to rot. Any off-putting smell is a clear sign that the potato is no longer good to eat and should be thrown out.

What is the right way to store potatoes
The best place to store potatoes is in a cool, dark, dry place at an ideal temperature around 7–10°C. Such a place like a pantry, cupboard, or open basket with ventilation would be very good. One should not store potatoes in a fridge because at very low temperatures, the starch turns into sugar, changing its taste and texture. Store them in a breathable bag, like a paper or mesh sack, for good air circulation and to prevent moisture from developing, which can rot or mold the potatoes. Also, store them away from onions, as they release gases that will make potatoes turn bad faster.