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. Optional extension requires additional time and materials. Bubble, Bubble, Toil and Trouble Journal Staff, J. Chem.