Osmosis - naked eggs in golden syrup

My GCSE classes always like this. If you use good quality free range eggs they will last longer. The shells take longer to dissolve than cheap ones but the membranes are stronger so less likely to break. The syrup can be reused as often as needed for one set of eggs. It will get thinner but it still works. When the eggs are past their best dispose of them and the syrup as well. Each year when you teach this you will need a new set of eggs and a new jar of golden syrup.