Rubber Egg

~ Put the raw egg in the bottom of a wide-mouth glass jar. Fill with white vinegar. Cap and set aside for two weeks.
~ Tiny bubbles will form on the shell, a sign that acid is acting on the alkaline shell and slowly dissolving it.
~ Open the jar regularly and gently test how the egg feels.
~ The egg will "grow" (expand) in size.
~ The vinegar will dissolve the shell and cook the membrane so that the egg feels like a water-filled balloon.
~ Remove the egg from the jar. Wash carefully. Hold the egg to the light to see the floating yoke. Gently roll and bounce the egg.