Can you still eat eggs whose shells have gone moldy? Read this and you'll understand

Mold growing on an eggshell shows that it has clearly been contaminated, and the contamination can reach the inside through the eggshell's tiny pores. If eggs get rained on or exposed to moisture, the protective film on the shell surface is washed away, allowing bacteria to invade the inside of the egg, causing it to go moldy and spoil, so that black spots and mold appear on the shell; eating such eggs can harm the human body and easily cause food poisoning.

There are many invisible tiny holes on the surface of an eggshell, so if the outer surface goes moldy, bacteria can very likely infect the inside. It is best not to eat them. If you really cannot bear to throw them away, you can crack the egg into a bowl and check: if the yolk is still intact, the white has not changed color, and the whole thing does not smell off, then it should be safe to eat. Even so, it is still better not to eat it.

Eggs also have a shelf life. At a temperature of 2-5°C, eggs keep for 40 days, while at room temperature indoors in winter it is 15 days, and at room temperature indoors in summer it is 10 days; once eggs pass their shelf life, their freshness and nutritional value are both affected to some degree. If stored too long, eggs will spoil due to bacterial invasion, showing phenomena such as the shell sticking to the contents and the yolk breaking.