With U.S. Grade A Eggs, the shell must be clean, unbroken, and practically normal. The air cell must not

exceed 3/16 inch in depth, may show unlimited movement, and may be free or bubbly. The

white must be clear and at least reasonably firm so that the yolk outline is only fairly well

defined when the egg is twirled before the candling light. The yolk must be practically free from

apparent defects.

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