How dirty are egg shells?

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Key Points to Note: Shell eggs need not be washed as any process that wets the shell may facilitate the entry of microorganisms. It is not surprising to find bacteria on egg shells since eggs can come into contact with bacteria during release and following exposure to the environment..
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Crab MalletSeafood/ Crab Mallet A wooden crab mallet is a perfect way to crack open a hard-shelled type of seafood, like a crab or a lobster, without damaging the soft and delicate meat on the inside..
If you soak this egg shell in vinegar (which is about 4% acetic acid), you start a chemical reaction that dissolves the calcium carbonate shell. The acetic acid reacts with the calcium carbonate in the egg shell and releases carbon dioxide gas that you see as bubbles on the shell..
If you buy frozen soft shell crabs, they are almost certainly 'dressed' (cleaned) and ready to cook. If they are fresh, however, you'll need to prep them first. It's a simple process that begins with snipping straight across the front part of the shell just behind the eyes.
Could be a result of the fact that they are pre-cooked, pre-frozen. All in all, crab meat sticking to the shell is not big problem whether pre-frozen or fresh. ... If it is at all possible, try to find some "fresh" crab and see if your luck changes. We really don't believe you're cooking them too long or not long enough..
Eating contaminated shellfish can lead to foodborne illness.