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Homemade Lava Lamp

Homemade Lava Lamp!

You will need:
A bottle/glass
Vegetable oil
Food colouring
Alka Seltzer tablet
An adult.

Add the food colouring to 120ml (1/2 cup) of water.
Pour the oil into the bottle/glass until about 3/4 full.
Add the coloured water to the bottle/glass being sure to leave a few centimetres of space at top.
Break up the Alka Seltzer tablet (do not put them in your mouth) into a few pieces then drop in a small piece. More can be added for a bigger reaction or when the bubbling starts to slow down.