I have always been worried by delicate shells. There is a tuna can nailed to a piece of wood that I keep oyster shell in. When I think of it they get a sandwich bag of lobster shells that I ground up in the food processer and then froze, if we have shrimp they get those shells, and I've been microwaving their egg shells when I cook, then processing them up with whatever scraps I give them. I figure the microwaving would lessen the viability of germs etc.
I did get some wooden eggs, but will wait to use them until next month when broodiness would be acceptable. February last year we had the frozen chick experiment, so not to repeat that, for this set up, March or April will be a better time. Then perhaps some SS from Fabius, some Buckeyes from Ginny, and something blond for visual pleasure. I love chicks!
Edited to correct autocorrect's correction. I typed broodiness, which was changed to bloodiness,
Sigh.