How does it work? What makes the food colouring in the milk move? We think that the way it works is that the chemicals in the dish washing liquid reacted with the food colouring chemicals.
Can you relate this to something in your everyday life? This relates to everyday life because it’s like when you do the dishes, when you put the dishwashing liquid into the water the chemicals react and make bubbles.
How could you build on this experiment to make it an interesting science fair topic? You could test it on even more colours and see which one moves the most. You could also try it with different amounts of dishwashing liquid.