Is boiling eggs not fresh

Boiling an egg and bursting it does not necessarily mean it is not fresh, it may be related to factors such as the freshness of the egg, cooking method, and temperature changes. The main reasons for eggs bursting are insufficient freshness, rapid heating, cracked eggshells, high water temperature, and failure to warm them up in advance. When the freshness of eggs is insufficient, the adhesion between egg white and the inner membrane of the eggshell decreases, and the internal gas expands when heated, which can easily lead to bursting. The fresh egg chamber is relatively small, but after prolonged storage, the chamber expands and the gas pressure increases during heating, which may break through the eggshell. When making a purchase, freshness can be determined by observing the luster of the eggshell, shaking it without noise, and conducting a water immersion test. Keeping the eggs at room temperature before cooking can reduce the risk of cracking caused by temperature differences. Excessive heat or a sharp rise in water temperature during the cooking process can cause an imbalance in pressure inside and outside the eggshell. Boiling in cold water over low heat can effectively reduce the probability of bursting. When there are subtle cracks in eggshells that are not visible to the naked eye, crack propagation at high temperatures can also cause bursting. Before cooking eggs, use a needle to puncture a small hole at the blunt end of the eggshell to release internal pressure. It is more explosive to boil refrigerated eggs taken out of the refrigerator in winter. It is recommended to reheat the refrigerated eggs before cooking.

For daily egg cooking, it is recommended to use fresh eggs, put them in cold water and keep the heat low. The water should completely cover the egg body. Adding a small amount of salt or white vinegar to water can help solidify protein and reduce exudation. After cooking, immediately supercool to facilitate peeling and check the integrity of the eggshell. If frequent egg bursting occurs, it is necessary to check the storage conditions or change the purchasing channel. Reasonable control of the cooking process can maximize the retention of egg nutrition, and whether it bursts or not is not the only criterion for judging quality.