All you need is
- An empty Coke bottle, If you dont have a Coke bottle, you can use a water bottle, plastic tub with lid, baby food jar or even a sample pot
- Cooking oil
- Alka Seltzer or other Fizzing Tablet (we used Superdrug)
- Food colouring of your choice
- A glass of water
- and your set to goAdd oil, water, and food coloring to the bottle. Fill the bottle 3/4 of the way full with vegetable oil, then top it off with water (leave a small gap at the top) and about 10 drops of food colouring (or enough to make the solution appear fairly dark). its best to get an adult to do this as the kids normally pour too much in.
Cut an Alka-Seltzer or fizzing tablet into pieces. You can either ration the pieces to make your lava lamp last longer or add more than one piece at a time for more interesting effects.
Add pieces of the tablet to the bottle, but leave the lids off. if you close the bottle, you wont get as good a result.