I have recieved and seen ppl put a stamp on their hatching eggs. This ensures that the eggs that they are recieving are the sellers eggs. That way if they are damaged durning shipping you know that it is your eggs that are broken, not randoms. I have purchased a personalized stamp to stamp my eggs. I figure that I have hatched eggs with this stamp and had no problems hatching and I have marked my broody hens' eggs out in the barn with a sharpie marker with no effect to the hatch rate. My stamp is not large and is letters so no heavy ink would be left as in a picture stamp. So my question is DO YOU THINK IT IS A BAD THING TO STAMP YOUR HATCHING EGGS?