Today we conducted an experiment. We put milk in a bowl and put in a few drops of food colouring. Then we added some dishwashing liquid. The food colouring suddenly started swirling around in the milk. This was caused by a chemical reaction.
The dishwashing liquid bonds to the protein molecules in the milk and starts to break them apart. The surface tension of the skin on top of the milk was also disrupted and that's why the colours started swirling towards the outside edge of the bowl.
Some of this flash science talk was a bit over our heads. We did our best to understand but all in all, we just thought the experiment was pretty cool!