I've been keeping the egg shells as we use them in a quart container in the kitchen. I bake them at least once a week, maybe more as the bin gets full. Hubby says they stink and that I need to just buy oyster shells. I really don't want to spend more money when I can use the perfectly ok shells. Anyone have advice on how to store the used egg shells without stinking? (I wash them before they go into the bin) Thanks