Egg Quality • Commercial grading of eggs according to the USDA standards • External quality: shell characteristics, shape, soundness, cleanliness, & color • Interior quality: size of the air cell, firmness of the white, & the yolk (distinct or flattened during aging) • Evaluated by candlingEgg Quality • Commercial grading of eggs according to the USDA standards • External quality: shell characteristics, shape, soundness, cleanliness, & color • Interior quality: size of the air cell, firmness of the white, & the yolk (distinct or flattened during aging) • Evaluated by candling