Carefully add 1 egg to a jar.

Pour vinegar into jar.

(Optional) Add 5-8 drops of food coloring to jar.

Let the egg remain in the jar for 48-72 hours.

When a film forms on the top of the liquid, then it is time to take the egg out.

Carefully remove the egg from the jar and rinse with cool water.

Gently roll and bounce the egg.

To contain your mess, try bouncing over a large cookie sheet, plastic bin, etc