Adding calcium/ crushed shells to their diet will help, you can also buy a water soluble tonic to add to their water that will give them the optimum amounts of vitamins and mineral they need to produce hard egg shells. Young hens will produce the hardest egg shells and older hens at the end of their laying years will often start to lay soft/ rubbery eggs.
It helps harden the egg shell
no
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the shell of an egg
This is an egg that can be in a shell and out of a shell.
the shell of an egg
The yolk - is formed within the bird's reproductive system. As it travels through the bird's body, the shell is created from stored calcium and other minerals, which harden as soon as the egg is laid.
egg shell
A leathery shell is a shell that is flexible rather than solid like the shell of a bird egg. A snake's egg has a shell that is flexible, as does a turtle's egg.
by lap dancing renzmtrovela: because the egg white and egg yolk is made before the egg shell it puts the egg shell around it
Lack of humidity
Yes, by boiling an egg, the shell will be damaged when an object is inserted into the shell or the egg.