What You’ll Need:
- Food coloring (red, yellow, green, blue)
- Dishwashing soap (Dawn brand works well)
- Cotton swabs
What To Do:
1. Pour enough milk in the dinner plate to completely cover the bottom to the depth of about 1/4″. Allow the milk to settle.
2. Add one drop of each of the four colors of food coloring — red, yellow, blue, and green — to the milk. Keep the drops close together in the center of the plate of milk.
3. Find a clean cotton swab for the next part of the experiment. Predict what will happen when you touch the tip of the cotton swab to the center of the milk. Did anything happen?
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 a few seconds. Look at that burst of color!
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?
The science activities
• stimulate children’s curiosity
• help children develop own understanding of the natural world
- encourage children to be persistent problem solvers.