The most common way is to take a cup of water and put the egg in the water. If the egg floats, it is an old egg and is likely to spoil soon. If the egg sinks to the bottom of the cup, it is still fresh.
Hold the egg and shake it a little. If you hear a sound, it is likely to be a rotten egg. If no sound is heard, the egg is still fresh.
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When you crack the egg into a cup, if the egg is rotten, the yolk will be flattened and mixed with the egg white. If the egg is old but not rotten, the yolk is easy to break.
For fresh eggs, the yolk is orange or yellow, round in shape, shiny and not easily broken.
Rotten eggs will have a strong unpleasant smell, while fresh eggs do not have such a smell.
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Frequently asked questions
There are several ways to determine the freshness of an egg. Firstly, check the sell-by date on the carton. Secondly, you can perform a water float test: place the egg in a bowl of water; if it sinks and lies flat on its side, it is very fresh; if it sinks but stands on one end, it is still safe to eat but not as fresh; if it floats, it is bad and should be discarded.
A bad egg may have a cracked or fragile shell, and the egg white or yolk may appear runny or discolored (greenish, pink, or black). It may also emit a strong, unpleasant sulfur smell. If you notice any of these signs, discard the egg immediately.
Fresh eggs can last for several weeks if stored properly in the refrigerator. On average, they should be safe to eat for about 3-5 weeks past the sell-by date printed on the carton.
Always wash your hands before and after handling eggs. Store eggs in their original carton and keep them in the main body of the refrigerator, not in the door, where the temperature is more consistent. Do not wash eggs before storing them as this removes their protective coating, making them more susceptible to bacteria.
It is generally safe to eat eggs a few weeks past their sell-by date if they have been stored properly. However, always perform a thorough inspection before consuming older eggs, and discard them if you have any doubts about their quality.