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Food science experts reveal that the reason boiled eggs stick to their shells is not the cooking time, but the level of doneness and how they are cooled afterward. Very fresh eggs tend to stick more to their shells, making them harder to peel, whereas peeling becomes easier after a few days have passed since they were laid. This is because the adhesion decreases due to reduced moisture and an increased pH level in the egg white. It is recommended to place the eggs in ice water immediately after boiling to stop the cooking process, which helps the egg white contract and reduces sticking. It is also preferable to use eggs that are a few days old and to avoid starting the boiling process in cold or hot water directly. Gently cracking the shell before peeling can also facilitate removal. The effect of salt or vinegar in easing peeling is limited; however, vinegar may reduce the leakage of egg white if there are cracks in the shell.
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