Peeling hard-boiled eggs using ice
An eggshell is permeable to air and water. A newly laid egg is covered by a natural coating called the bloom. This prevents loss of moisture from the egg and bacteria getting in. In my opinion, it is better to take advantage of this and not wash the eggs. The eggs are protected naturally and so do not need to be kept in the fridge. You can then wash the eggs just before you use them.
There are two membranes inside the shell: the outer shell membrane which adheres to the eggshell and the inner shell membrane surrounding the egg white and yolk. As time goes by, air enters the egg through the pores and fills the gap between the two membranes and the egg cell expands. It is this gap between the two membranes which affects how easy it is to peel a hard-boiled egg.
I’ve read that in order to peel very fresh eggs, it helps to immerse them in cold water and ice cubes so I thought I would give it a try to see if it helps. For the purpose of the “eggsperiment” I used 15 eggs of varying sizes and laid between 0 and 3 days ago (0 being a couple of hours previously).
The eggs were cooked in boiling water for 10 minutes. Cold water was then run over them and they were they plunged into the iced cold water. I left them for 45 minutes.
I found that eggs laid the same or the previous day were very difficult to peel. Eggs that were two days old were OK. Eggs which were three days old or more were good. I also found that putting the eggs in ice made no difference whatsoever and is not worth doing.