In Science we've been talking about osmosis and diffusion. The kids loved this experiment. We first put our farm fresh egg in a vinegar bath overnight and by the morning the shell was pretty much gone.
We then took our egg and placed it in a bowl full of dyed blue water for three hours. And what a brilliant blue it became! And finally we put it in a bowl full of clear water. It was interesting to note how semipermeable the membrane of the egg is and just how blue most of the white of the egg became.