Perhaps a cotton or muslin draw-string bag? A hairnet? Some laddered tights or stockings? Socks! OK, I now have a new use for my old socks. Washed first, of course. Actually, now I’m curious - if you added a strong source of flavour to the water, would it penetrate the shell and flavour the egg while cooking?
@Simon_C I don’t think much penetrates the shell. For Easter coloring we use brown onion skins and they flavor the eggs a bit only where the shell cracks.
I wish my whisk had a hole in the handle.
No need to waste a wish, @john.jcb, you have money and the internet!