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Your Safer Source for Science
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Fascinating reaction has it all—bubbling and effervescence, and reversible orange and blue color changes as a precipitate appears and then disappears. Many concepts come into play in this colorful demonstration of competing redox reactions, catalysis, and transition metal complex ions. A great demo all around, especially if your school colors are orange or gold and blue!


  • Oxidation & Reduction
  • Catalyst
  • Complex Ions