Color change of beads could be demonstrated if UV source available. Requires access to water, hot water and ice and UV lamp or sunlight. Takes time for beads to return to colorless state. The Oxygen Content of Air Journal Staff, J. Chem. Reaction takes 30-45 minutes to complete.
Water is required.
This activity uses fire. Special caution is required. The Cartesian Diver K. David Pnkerton, J. Chem. Diver could be demonstrated. Requires access to water, hot water, and ice.