- 6 raisins
- Glass tumbler
- Baking soda (or Alka Seltzer tablet)
- Pour a cup of water into the glass jar.
- Add one teaspoon of baking soda and stir until dissolved.
- Gently add one-fourth cup of vinegar and wait until it stops fizzing.
- Drop in three or four raisins.
- Watch and see what happens (it takes about 10 to 15 minutes).