Swirling Colors
Can you make colors move in milk? Then perform this experiment.
Things you’ll need: whole milk, a shallow dish, food coloring, and liquid dish soap.
1. Pour whole milk into the shallow dish.
2. Let the milk warm up to room temperature.
3. Place drops of different food coloring in the milk. DO NOT STIR.
4. Place 1-3 drops of liquid dish soap in the middle of the dish. Enjoy the show!
3 seconds after 2 drops of liquid dish soap
5 seconds after 2 drops of liquid dish soap
The colors move as the soap spreads across the surface of the milk. Once soap covers the surface, the swirling will stop instantly (if you use water).
In whole milk, fat is the secret ingredient that keeps the colors move. As the soap spreads out, it sticks to tiny globules of fat. As the globules take up soap, they make more room for soap to spread out.
Danupon Drake 