Any DYC Vinegar
Pour vinegar into a glass.
Place raw egg in glass and leave for 72 hours.
Gently lift out the egg out of the vinegar and rub away the shell. You should see a white membrane left behind.
Rinse under gently running tap.
Now get ready to bounce your egg. This is best done outside, with a clean up kit on hand!. Bounce your egg 10-15cm above a surface and watch it bounce like a rubber ball.
Be careful as higher than this your egg is likely to break open. Inside the yolk of the egg will be raw.