1. Carefully pour some milk in a dish so it just covers the bottom. 2. Gently add one or two drops of red, blue, and yellow food coloring to the same spot in the center of the milk. 3. Dip a cotton ...

One way they can do this is to use a process called chromatography. In the activity below, you can try chromatography to separate colors in a mixture of food coloring! Place a coffee filter on a tray ...