This experiment just didn’t seem to work for me when I was testing it out for Zara’s Science Party. I thought it might be the food colouring I got from Migros, as an old black one I had from South Africa worked but none of the colourful ones I picked up from their supermarket. But my friend Marta did it and said it worked great. So here are the instructions, hopefully you will have better luck than I did. (at least I could dip paper into my milk and co ordinate the “marble” look with my table!).
Liquid dishwashing liquid soap
- Pour a thin layer of the whole milk in a shallow dish.
- Squeeze droplets of the food colouring on the surface of the milk.
- Next, dip an Ear Bud in the dish soap and then in the milk, preferably in the centre of a spot of food colouring.
- Now, watch the colors explode all over as the detergent interacts with the fat molecules in the whole milk!