Good eggs and bad eggs are different under the light. A good egg is translucent and slightly reddish when facing the light, and the outline of the yolk can be clearly seen. Even if the poor eggs are exposed to strong light, they are still opaque and look dim. ?

2. Shake and listen

Shake the egg gently near the ear. If there is no sound, it means that the whole egg air chamber and yolk are intact, and the bad egg can hear the sound of water when it is shaken. ?

3. Check the eggshell carefully

The shell of a good egg is bright in color and rough to the touch; The eggshells of bad eggs are black and smooth to the touch, and some bad eggs have red or black mildew spots.

4. Turn the egg

Place the egg on a flat surface and turn it gently with your fingers. When the fresh egg turns, there is resistance in the eggshell, and it will stop after two or three weeks. Bad guys turn long and fast; If the egg is not spinning fast or slow, it proves that it is not fresh enough.

5. Water immersion method

Put the eggs in a cold water basin. If they lie flat on the bottom of the water, they are fresh eggs that have just been produced. If the egg is tilted or upright in water, it may be stored at room temperature for more than 10 to 20 days, and it can still be eaten; If it floats on the water, it means that the egg has gone bad and can't be eaten.

Extended data:

The following kinds of eggs can't be eaten:

1, cracked eggs: During transportation, storage and packaging, some eggs will be cracked and cracked due to vibration, extrusion and other reasons, which are easy to be invaded by bacteria. If they are left for a long time, they should not be eaten.

2. Sticky-shell egg: This kind of egg has a tough and weak yolk membrane due to long storage time, and the yolk is close to the eggshell. If it is partially red, it can be eaten, but the egg membrane is still close to the eggshell, and it is dark black outside the skin. Those who have an odor should not eat it again.

3. Stinky egg: As bacteria invade and multiply in the egg, the egg shell becomes dark gray, or even breaks due to the expansion of internal hydrogen sulfide gas, and the mixture in the egg is grayish green or dark yellow with a bad smell, then the egg cannot be eaten, otherwise it will cause bacterial food poisoning.

References:

Shake when picking eggs-People's Daily Online