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Is there any truth to coating eggs with oil, placing them in the cartons upside down and then not storing them in the refrigerator - will make them last a few months???

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Conceivably, as the oil would block the pores in the egg shell and prevent evaporation/contamination. However, the oil would also eventually absorb in through the shell, so I would certainly avoid using mineral oil as some sites suggest, as it's toxic.

Having said that, I'm not sure of the logic behind storing them upside down.

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If you were to use food-grade mineral oil, you'd probably be okay, since it's specifically treated to be non-toxic. –  Martha F. Feb 10 '13 at 17:10
    
If you dip the bottom half then flip, it'll trickle down over the top half? That's the only reasoning I can think of for storing them upsidown. –  Yamikuronue Feb 11 '13 at 2:20

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