ok 2 out of the 4 turkey hens have gone broody (they tend to lay together in one big nest).
we thought we would let them try and hatch (if charlie has done his job)

i marked up 8 eggs with a pencil and my plan was to remove the others!!
well went to get them out today and there is 12 in the nest and the pencil mark has rubbed off!!!. the other 2 girls are laying and still want to lay in that nest with them rather than the other one we have made.
any idea what we can mark the eggs with that won't harm them
Mx