In our original experiment, we put an egg in a jar of vinegar and an egg in a jar of water . My girls noticed the bubbles around the vinegar egg.
The bubbly film on top of the vinegar is normal, but our looks a little odd because this was a fresh, unwashed chicken egg, straight from the nesting box.
Holding the egg seems quite odd, it is like a rubber egg, and tougher than it seems. Give it a bounce now!