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Grading eggs.

Eggs are graded based on United States Department of Agriculture (USDA) standards. These standards use certain specifications to determine the grade of an egg.

Table 1. USDA Quality Standards for Grading Eggs

Quality FactorAA QualityA QualityB QualityInedible
ShellCleanCleanClean to slightly stainedDirty
ShellUnbroken; practically normalUnbroken; practically normalUnbroken; abnormalBroken, cracked, and/or leaking
Air Cell1/8 inch or less in depth3/16 inch or less in depthMore than 3/16 inch in depthDoesn’t apply
WhiteClear, filmClear, reasonably firmWeak and watery
YolkOutline slightly definedOutline fairly well definedOutline clearly visibleDoesn’t apply
Spots (blood or meat)NoneNoneBlood or meat spots aggregating not more than 1/8 inch in diameterBlood or meat spots aggregating more than 1/8 inch in diameter