1. Pour enough milk in the dinner plate to completely cover the bottom. Allow the milk to settle.
2. Add one drop of each of the four colors of the food coloring-red, yellow, green, and blue into the milk. Keep the drops close together at the center of the plate.
3. Find a clean cotton swab for the next part of the experiment. Predict what will happen when you touch tip of the cotton swab to the center of the milk. It's important not to stir the mix. Just touch it with the tip of the cotton swab. Go ahead and try it.
4.Now place a drop of liquid dish soap on the other end of the cotton swab. Place the soapy end of the cotton swab back in the middle of the milk and hold it there for 10 to 15 seconds. Look at the burst of color! It's like a 4th of July in a bowl of milk.
5. Add another drop of soap to the tip of the cotton swab and try it again. Experiment with placing the cotton swab at different places in the milk. Notice that the colors in the milk continue to move even when the cotton swab is removed. What makes the food coloring in the milk move?