Yay! The day before the Science party I found Alka Seltzer tablets, which means we could make mini lava lamps. It was a huge success and you can easily make one too. (Tip: we added in some glitter too!).


Flask or bottle

Vegetable oil


Food colouring

Alka-seltzer ( you can use salt, but this works much better)


  1. Fill the flask most of the way with vegetable oil.
  2. Fill the rest of the flask with water. The water will sink to the bottom under the oil.
  3. Add a few drops of food colouring; your choice of colour. The food colouring is water-based, so it will also sink and colour the water that is now at the bottom of the flask.
  4. Break an alka-seltzer tablet into a few small pieces, and drop them in the flask one at a time.
  5. Watch your lava lamp erupt into activity! As the reaction slows down, simply add more alka-seltzer.