The classic Elephant's' Toothpaste demonstration HD

Chief Scientist Carl Nelson demonstrates the catalytic decomposition of hydrogen peroxide. Hydrogen peroxide decomposes to form oxygen and water. The reaction is slow at room temperature. A catalyst added to the peroxide will speed up the reaction. It is catalyzed here with potassium iodide. The hydrogen peroxide used here is 35% concentration, more than ten times what most people have at home. The mixture of soap, peroxide and catalyst generate a huge amount of foam when mixed together. Food coloring gives the foam a bright color.