I've heard of you NEMarvin! Welcome!

I have not had any problems. I use one egg yolk per batch and use it within 2 weeks or so. I did tend some chickens for a few weeks a couple of times and had to collect eggs so I kind of know what goes on in the coup and it rhymes coup.

I wash eggs I'm going to use on the outside well and use an egg cracking method that doesn't introduce any shell back into the egg. I use to crack on side of bowl until my good friend Jacques Pepin showed me the more better way (down on cutting board). Also, make sure your hand are "impeccably clean" as my other good friend Julia Child says in her sassy tone as I let the egg white run thru my fingers to capture the yolk.

Good Luck!!!