Firstly, we made predictions about what would happen if we mixed milk, food colouring and dish washing liquid. Lots of the children thought it would (or hoped it would) explode.
We watched very carefully as the food colouring sat in the milk and then scattered when the dish washing liquid was added. There were lots of oohs and aahhhs echoing around the room.
The next day, we thought about what would happen if we mixed water, oil, food colouring and salt, once again the hope of an explosion was high on the list of predictions!
The results were exciting and provoked lots of thoughtful discussion; why didn't the oil mix? What does the salt do? Why do the colour blobs float to the top?
You might want to try this at home by yourself, just add 1/2 cup of water, 1/2 cup of oil, a few drops of food colouring and finally a 1/4 cup of salt. The results are quite cool!
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