Posted: 12/03/2014 at 20:35
Oh Lordy, I remember isinglass; it was in a bucket in the shed, and my father said 'that is how we preserve the eggs'. This would have been about 1954, so it was used long after the end of the 2nd World War.(also in the film Oklahoma, they sing about 'isinglass curtains you can roll right down in case there's a change in the weather')
Remember that most people would not have had refrigeration; though even now I don't keep eggs in the fridge, but I DO know when they are past their sell by date, which they would not have known then.