How to Tell if Eggs are Bad
A Highly Contagious Bacterial Infection
Proponents of the float test say that eggs that float are bad, and those that sink are good, but that may not be true.
Eggshells are porous, which allows air, moisture, and some contaminants to pass through. Spoilage bacteria are the most common culprits of eggs turning rotten. When laid, the hen deposits a protective bloom, but this cuticle is not completely impenetrable, so whether or not you wash the egg, bacteria will eventually traverse that porous shell.
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