Sometimes, you find that the egg shell is a little dirty. If you want to clean it, you'd better not clean it. Because the shell of each egg has a natural protective film, that is, the cuticle, which closes thousands of small holes on the surface of the eggshell, so it is difficult for bacteria outside to enter, and nutrients in the eggshell are not easy to lose. If the egg is cleaned, the protective film will be damaged, and the external bacteria, viruses and other substances may enter the egg, causing the egg to deteriorate. In addition, there are some precautions when storing eggs. The first is the placement direction. The correct placement direction of eggs is the big head up, because there is an air bag at the top of the big head inside the egg, which can prevent the egg yolk from getting close to the egg shell. In this way, there will be no yellow or loose yellow phenomenon. It can also prevent microorganisms from invading the egg yolk and ensure the quality of eggs. If it is placed horizontally at will, it will be placed for a long time, especially when the temperature is high. Under the action of protease, the thick protein mucus will remove part of the water, thus losing the role of fixing the egg yolk. The egg yolk will float upward because of its small specific gravity, close to and stick to the eggshell, so it is easy to disperse the yellow when boiling the egg. If the small head is placed upward, the egg yolk will also float and stick on the eggshell. In addition, if eggs are stored in the refrigerator, please eat them as soon as possible after taking them out of the refrigerator and don't put them back. When the eggs are taken to room temperature from the refrigerated state, the eggs will sweat, and bacteria and viruses will seep into the eggshell along the small water droplets, thus polluting the egg liquid. Therefore, the eggs taken out cannot be stored in the refrigerator again. (outlook new era)