Mango skin contains polyphenol oxidase. During transportation, when the mango skin is scratched, rubbed, or otherwise exposed to pressure, the polyphenol oxidase will undergo a chemical reaction, and under the action of oxygen, it will turn into a black substance, that is, the black spots on the surface of the mango skin. Besides, some mangoes can develop black spots as they ripe. These spots normally develop around the stem of the mango. But these spots are small in size.
Sometimes the dark spots can develop across the small surface area of the mango, this can happen if the sap oozes out from the mango stem and dries on its skin. (These dark spots are small in size and are generally in a line). This doesn’t necessarily mean that the mango is bad. More often than not these spots are superficial and might not impact the taste and the quality of the fruit.
If there are big dark spots across the whole body of the mango, its quite possible that the fruit has rotten. Also a mango infested or affected by some disease, will develop medium/big dark spots around its body. Mangoes infested by fruit insects can have small holes in it too.
The fragrance or smell of a mango is a good indicator of its state (However it needs a trained nose). The other easy and only foolproof way to ascertain whether the mango is safe to eat or not, is to cut the mango and see if there are any dark spots on the flesh of the mango. If you do see black spots on the inside, then there is a good chance that the mango is turning bad.
However, all is not lost. If only a small portion of the mango flesh has dark spots, you can remove the part which has been affected and the rest of the mango can be eaten.
Here is a word of caution though, whenever inner mango flesh develops dark spots, it means the process of decaying has started. Sometimes, small worms can also develop inside these dark spots. So, if you intend to feed these mangoes to young ones in your family, please make doubly sure that they are safe to eat. Better safe than sorry, isn’t it.
If the black spots on the surface of the mango skin do not penetrate into the flesh, you can safely eat the mango.
Once the dark spots continue to penetrate into the flesh, these indicate that the mango has started to rot, and such mangoes can no longer be eaten.
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