 First, let's discuss the exterior characteristics to consider when evaluating your eggs. Hins will occasionally lay calcium deposits, tiny mistakes in shell structure. These eggs have calcium deposits or calcifications. They can range from very small, sandy surface deposits to very large ones. You, as the flock manager, cannot control the size or frequency of calcifications. A large deposit can downgrade an egg to grade B on exterior grading. How do you know if a deposit is too large? If you can drag your fingernail over the deposit and pull it off leaving a hole, then that deposit is large enough to downgrade the egg. This egg has a small deposit that does not detract from the exterior grade. It would be graded AA or A. This egg has a slightly larger deposit but is not large enough for the egg to be downgraded to grade B. You do not want to enter grade B eggs or sell grade B eggs to your customers.