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Quote: No, there has never been any soaking through, leaching, or penetrating the shell here EVER or any evidence of "toxic fumes". A Sharpie Permanent Marker is perfectly safe for marking 'eggs for hatching'. Lisa My Sharpies are all label non-toxic directly on the pen. While the fumes...

I use a good ole sharpie and haven't had a problem. Like another poster said, pencil tends to wash off if you are misting waterfowl eggs!