In accidental mixtures, the principle of bateil beshishim is applied--i.e., if a forbidden food accidentally falls into a pot wherein a permitted food is cooking, the permitted food is unaffected and remains edible if it is at least sixty times the volume of the forbidden food.

A blood spot in an egg is not kosher and could possibly render the entire egg not kosher.

* Also spelled bittul b'shishim

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