You Will Need:
1 pie plate, whole milk (about a cup), 3-4 different colors of food coloring, 1 bottle liquid soap
Fill the pie plate with milk and allow it to come to room temperature. Add a few drops of food coloring to milk. Put a single drop of liquid soap in the middle of your plate, and watch your milk colors explode!
Ask: “How much milk should we use?” What colors do you want to add?” “How many drops of blue are you going to use?” “What do you think will happen?” Why this works: Milk contains fats and proteins in solution. Any change in the solution (adding soap) affects these fats and proteins. The soap makes the fats and proteins twist, bend and change into all kinds of shapes. The soap has weakened the surface tension, which is the watery skin that holds the liquid’s molecules together. When they move they mix the colors. Ask “What happened to the colors?” “ Do you see new colors now?” “Why do you think the colors move?”