Reason:

This practice is unhygienic.

This is because there is a protective film on the surface of fresh eggs, which makes the water in the eggs less volatile and prevents microorganisms from invading. After the eggs are cooked, the membrane on the egg shell is destroyed, and the gas in the air cavity inside the egg escapes. When the egg is placed in cold water, the temperature in the air cavity will drop sharply and the pressure will be negative. In this way, water and microorganisms can enter the egg through the pores on the eggshell and the double-layer membrane inside the shell, making it easy to spoil during storage. Deterioration. So it cannot be rinsed with cold water.

Eggs:

Eggs, also known as chicken eggs and chicken eggs, are eggs produced by hens. They have a hard shell on the outside and an air chamber, egg white and yolk inside. Rich in cholesterol and nutrients, an egg weighs about 50 grams and contains 7 grams of protein. The amino acid ratio of egg protein is very suitable for the physiological needs of the human body and is easily absorbed by the body. The utilization rate is as high as over 98%. It has high nutritional value and is one of the foods commonly consumed by humans. Boiled eggs will lose a small part of their nutrients, but they will also have a sterilizing and disinfecting effect, so it is recommended to be cooked and eaten.