This problem involves some basic principles of food safety and food quality. Eggshells are hard and are usually not used for eating. If there is a barcode on the eggshell, the barcode may contain some information about the egg, such as the date of production, shelf life and so on. However, no matter what information this barcode contains, it is not recommended to eat eggshells.

Because eggshells are mainly composed of calcium carbonate, they may decompose at high temperature and release some harmful substances, such as calcium oxide and carbon dioxide. These substances may have adverse effects on human health. In addition, other substances, such as chicken excrement or bacteria, may remain on the eggshell surface, which may also pose a threat to food safety.

Therefore, it is recommended not to try to eat egg shells, especially those with bar codes. If you want to eat eggs, you should choose fresh and intact eggs to cook.