I mark dates on our eggs with a rubber stamp. The stamp has bands so you can change the date. I have an ink pad that I have loaded with food grade ink. It is the kind of ink that is used to print on meat and cheese. I have never hatched any eggs so I don't know about that but I eat the eggs that have been date coded.
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I agree. I've found that these birds (we have chickens, turkeys and ducks), both pre and post hatch are CONSIDERABLY less fragile than we were led to believe from posts and books.