Re: How can I kept an egg from rotting?

Ryann--

Thanks to refrigeration it is very rare that eggs will actually "rot" the 
cold will eventually evaporate the inside of the egg before it will rot.  
Of course, leaving eggs un-refrigerated will of course cause them to 
rot.  Refrigeration will not actually have any major effect on the 
eggshell.  There will be a slight change with the cooling of the egg but 
it is on a microscopic level.  Just like if you hard boil an egg you tend 
to notice that the eggshell remains the same and most of the time does 
not even crack even though the molecules that comprise the shell expand.  
So in my opinion it would be safe to assume that refrigeration will have 
no impact on your experiment.  I would suggest though allowing the eggs 
to return to room temperature before proceeding with your experiment, the 
cold could keep whatever substance you use to discolor the egg from 
adhereing to the shell.  I hope this answers your question and good luck 
with your experiment!