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This is a fun experiment to do at home that explores the concept of surface tension and allows you to play with some mesmerizing materials, creating beautiful swirls of color and even some bubbles.

What you need:* A sheet pan or tray.* Toothpicks or popsicle sticks.* Food coloring.* Enough milk to cover the tray in a thin layer.* A small amount of dish soap. — **What you need:**
* A sheet pan or tray.
* Toothpicks or popsicle sticks.
* Food coloring.
* Enough milk to cover the tray in a thin layer.
* A small amount of dish soap.

Scatter some drops of food coloring across the sheet pan or tray of milk.

"When liquid dish soap is added to milk with drops of food coloring on the surface, the soap reduces the surface tension of the milk and reacts with the fat....

Use the toothpicks or popsicle sticks to swirl the soap and coloring through the milk, creating a mesmerizing work of ephemeral art.