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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