Here is a really cool experiment that has a surprising outcome:

The key to this experiment is the chemical reaction between the milk and the dish soap. Dish soap has molecules with properties that allow them to dissolve both water (a hydrophilic property) and dissolve in oil or fat (a hydrophobic property). The combination of these two properties is what makes the soap react with water to clean food and oil off your dirty dishes.

Milk contains both fat and water, so the dish soap seeks out and breaks down these fat molecules, which allows the food colouring to flow freely within the now watered-down milk. As the dish soap molecules continue to chase the fat molecules around liquid, it swirls and twirls the colours that you see in the experiment.

Try experimenting with different types of milk (skim, whole, etc.) and different dish soaps to see how they react together.

We hope you like the video!  Thanks to the Canada Science And Technology Museum for making this!