How to tell if an egg is fresh or spoiled

The main methods are:

1) Appearance method. The egg shell has a layer of hoarfrost powder, which is not very smooth when rubbed by hand, and the fresh egg with a complete appearance is fresh, and the egg with a smooth and dark, incomplete and cracked shell is not fresh.

2) Hand crank. When buying eggs, pinch the eggs with your thumb, index finger and middle finger and shake them, the ones that have no sound are fresh eggs, and the ones that make a shaking sound when shaking by hand are bad eggs. The louder the sound, the worse it is.

3) Irradiation method. Gently hold the egg with your hand and observe the light, the good egg protein is clear and translucent, with a small empty room at one end, and the bad egg is gray and dark, and the empty room is larger. Some eggs have stains, which are stale or spoiled on the table.

Appear. 4) Floatation method. Take 500 grams of water, add 50 grams of salt, dissolve, put the eggs in the water, and sink horizontally.

The bottom of the water is fresh eggs, the big head is on the top and the small head is slightly floating, it is the egg that has been left for too long and completely floated.

On the water, it's the bad eggs, and the eggs have rotted and spoiled.

Put the eggs in a glass of water, if the eggs sink to the bottom, indicate freshness.

If it floats in the middle of the water, it should be consumed as soon as possible.

If it floats up and floats to the surface of the water, it means that it has spoiled and is inedible.

When selling eggs, you can take a look.

Whether there is a small pit the size of a pinpoint on the surface of the egg, if there is, it is fresh, if the surface of the egg is relatively smooth, then it is not very fresh.

1. Hard-boiled eggs, if they smell a sour smell, they are already very bad.

2, Li Peipai When we peeled off the egg shell, the color looked yellow, and when we picked it up, it was also broken and could not be eaten anymore.

3. There was no problem in the first two steps, and when I ate it, I felt that there was a peculiar smell in Zhongzhou, which meant that the eggs were slightly deteriorated and could not be eaten.

Summary. You can also put the eggs in a basin full of water, if the eggs sink in the water, they are fresh eggs, and the floating eggs are bad. This is because fresh eggs have a larger specific gravity than water, so they will sink when placed in water.

When the egg is broken, the protein inside will produce gases such as ammonia and hydrogen sulfide, and if there is gas in the eggshell, the specific gravity of the egg will be smaller than that of water, so it will float when placed in water.

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Gently shake with your hands, there is no sound of fresh eggs, and there is the sound of water is the wheel of stupid old eggs; Put the eggs in cold water, sink the fresh eggs, and float the old eggs. The most direct way is to open the eggs and find that they are yellow, and the egg wax is mixed with the egg yolk, so it can no longer be eaten.

You can also put the eggs in a basin full of water, such as the eggs that sink in the water are fresh eggs, and the eggs that float up are bad. This is because fresh eggs have a larger specific gravity than water, so they will sink when placed in water. When the egg is broken, the protein inside will produce gases such as ammonia and hydrogen sulfide, and if there is gas in the eggshell, the specific gravity of the chicken and plum eggs will be smaller than that of water, and the peace talks will float when they are placed in the water.

The method of judging whether an egg has gone bad is as follows:

1. Open it directly. The easiest way is to know if the egg is bad or not to open the egg directly, if the egg white and the egg yolk are mixed together, it means that the egg is spoiled, and you will smell a rancid smell if you smell it carefully, the yolk of the egg is like a ball, and the egg white is gathered around the yolk, such an egg is not edible. Although this method is the most straightforward, it is not suitable for tea eggs, boiled eggs and other methods.

2. Float test. Pour water into a cup, and then put the eggs in it, if the eggs are lying flat on the bottom of the water in the water, then the eggs are very fresh and have not deteriorated, if the eggs are tilted or standing upright in the water, then the eggs have been stored for a long time, if the eggs are floating on the water, then the deterioration is very serious, do not eat them.

3. Shake to listen to the sound. Shaking to listen to the sound is the most commonly used method, especially when buying eggs, hold the egg in your hand and shake the egg, if you shake the egg when you find that the egg is very heavy and there is no sound, then the egg is fresh, if you shake the egg when you hear the sound of crackling or the sound of water or something, it is an egg that has been put for a long time, then such an egg should not be eaten.

4. Turn the eggs. There are many ways to judge whether the egg is broken, an egg, a table can be done, put the egg on the flat surface of the table, and then gently turn the egg, if the egg turns twice and stops, it means that the egg is very fresh, if the egg turns for a long time and turns quickly, the egg is broken.

Eggs

EGG, also known as chicken eggs, chicken eggs), is the egg laid by the hen, after fertilization can hatch chicks, which have a hard shell outside, and have air chambers, egg whites and yolk parts inside. Eggs contain a lot of vitamins, minerals and proteins of high biological value, and are one of the foods commonly consumed by humans.

The dangers of eating spoiled eggs

Eggs are nutritious food, which can improve the body's ability to avoid epidemics, but the nutrients of spoiled eggs have changed, and these bacteria will ferment and multiply in the stomach after ingestion, and the intestines will have abdominal pain, diarrhea, vomiting due to infection with these bacteria, causing acute gastroenteritis.

1. Cracks: In the process of transportation, storage and packaging, eggs will cause cracks and cracks due to vibration, extrusion and other reasons, which will easily be invaded by bacteria, and should not be eaten if they are placed for a long time.

2. Sticky shell: This kind of egg is stored for too long, the yolk membrane is weakened from toughness, the egg yolk is close to the eggshell, if the local red can still be eaten, but the egg membrane is close to the eggshell and does not move, the skin is dark black, and there is a peculiar smell, it is not suitable to know the food.

3. Stillbirth: Eggs that stop developing due to bacterial or parasite contamination during incubation, coupled with poor temperature and humidity conditions, are called stillborn eggs. The nutrients contained in this egg have changed, such as the prolonged death, the protein is broken down to produce a variety of toxic substances, so it is not suitable for consumption.

4. Moldy: Some eggs are sold in the state of rain or moisture, which will wash off the protective film on the surface of the eggshell, so that the bacteria will invade the inner surface of the egg and become moldy and deteriorate, resulting in black spots on the eggshell and mold, and this kind of egg is not suitable for purchase and consumption.

Methods to determine whether an egg has gone bad: directly knock it open, float test, shake it to listen to the sound, observe it in the daylight, and touch it with your hands.

1. Knock it open directly.

Crack the egg shell directly, if the egg yolk is scattered, the egg white and egg white are mixed together, or there is a rancid smell, it means that the egg has gone bad. If the yolk is nearly spherical and slightly raised, and the egg whites (or whites) are only gathered around it, the egg is fresh.

2. Float test.

Place the eggs in a basin of cold water at a water level about twice the height of the eggs. If the egg lies flat on the bottom of the water, it is very fresh, and the fresh egg will sink to the bottom of the bowl, and it may be on the side against the bottom of the bowl; However, if it is tilted or upright in the water, it means that it has been stored for a long time; Stale eggs (which have been left out for about a week) will also sink to the bottom of the bowl, but there will be a slight up-and-down fluctuation. And if it floats on the water, it means that the egg has gone bad, don't eat it.

3. Shake to listen to the sound.

Put the egg between your fingers and shake it in your ear, and the fresh egg will not make a sound. Rotten eggs have the sound of slag, and the big ones have the sound of hollowing. The cracked egg has a crackling sound. The sound of water is the eggs that have been left for too long.

4. Sunlight observation.

Holding the egg in both hands like a tube, facing the sunlight or light perspective, if the egg is reddish reddish, the sail is translucent, and the yolk outline is clear, it is fresh; If it looks dull, opaque, or stained, the egg has gone bad.

5. Hand touch.

Touch the egg with your hands, the rougher the shell, the fresher the egg; The smoother the appearance, the lower the freshness. In addition, eggshells that have been exposed to rain or moisture have gray-black spots. There are oil stains on the shell of rotten eggs.