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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