Takes time for beads to return to colorless state. The Oxygen Content of Air Journal Staff J. Chem. No Requires access to water and use of a balance. Takes 45 min. or longer to complete. This activity uses fire.
Special caution is required.
The Cartesian Diver K. David Pinkerton, 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.