Eggs, submerge them in water and see: if this happens, throw them away immediately

This happens because there is a membrane between the flavor and the content. When the egg is not fresh, the membrane detaches , creating an air chamber that allows the egg to rise to the surface.
How to know if eggs are still good after breaking the shell

However, if the egg is already cracked, when it is raw, you can tell if it is good by analyzing the yolk. If it is dense and compact and remains attached to the white, then it means that the egg is fresh . If the egg white is runny, it means the egg is old and should be discarded.

Obviously you can also trust your sense of smell. A sulfur smell indicates that the egg is no longer fresh or has not been stored properly. In any case, faced with an egg that is not in good condition, it is better not to risk it.
How long can eggs be consumed?

Eggs should be consumed within a maximum of 28 days after being laid, because the risk is of contracting dangerous infections . After 28 days the eggs are usually good, but they lose their properties. So to enjoy them 100% it is best to consume them within two weeks.

Obviously it can happen that they spoil even before 28 days, so when in doubt, especially if children eat them, it is better to do the acid test . Sometimes they spoil due to poor storage . There are those who keep them in the refrigerator and those on the kitchen shelves.

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