Making a homemade lava lamp is great for getting little minds thinking. Kids will enjoy watching beads of colour bounce around within the solution as it bubbles away.
This exercise also creates an opportunity to explain density and why oil naturally rises to float on top of water and in this case vinegar, as it has a lower density.
If you would like to make your lava lamp glow in the dark, try adding phosphorescent powder (pigment) to vinegar with food colouring for an eerie glow.
Phosphorescent powder is non-toxic and is also often referred to as glow powder. You can purchase this ingredient easily on eBay or at other online retailers. Use with care as spills on carpet or clothing can be difficult to remove.
Note: You can keep adding more of you coloured vinegar mix to extend the life of your lamp.
Try making two different coloured vinegar mixes and add them to the jar together to see how they mix together!
When it stops bubbling, try sprinkling some salt into your lava lamp. What happens?
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