I was wondering what type of writing instrument every one use's to mark their eggs for turning. I almost used pencil on mine. Then I got to thinking, a pencil is lead, and an egg shell is a permeable barrier = lead leaching into the chick? I think next time I hatch I am going to get non-toxic markers and mark my egg as 1/2, 3/4, 5/6 etc. This way I can turn odd and evens to keep track of turning and also keep track at hatching. Using numbers will let me be able to say chick #3/4 pipped 16 hrs ago, and possibly help to catch any problems early. Or, if I am iffy on a egg during candling, you can immediately pick it out to check when needed. Does this sound like a good idea? Am I over thinking this whole hatching thing? LOL