It was great fun and carried on from the oil and water experiments we did last week which was good.
You need a bottle and some water, Pour about a couple of inches worth of water in and then top up with cooking oil. (This is where the gallon bottles from Costco come in handy)
Add some drops of food colouring and let the whole thing settle for a short while.
Break them up a little and drop them in.
You should get a great lava lamp effect as bubbles of water stained food colouring dance around the oil.
Once it dies down you can put the lid on.
Have a go. It’s fun.