No one is exempt from an occasional “bout with the blues.” The blues come and go as in this demo. Two colorless solutions and an indicator are mixed, producing a blue solution. Upon standing, the solution becomes colorless. The solution alternates between blue and colorless with shaking and standing, respectively. You’ll wipe those blues away with this fascinating demonstration. Teacher manual included.

Concepts: Oxidation–reduction, indicators, kinetics.

Time Required: 15 minutes

What’s in the Box?

• Dextrose solution, 500ml
• Methylene blue solution 10ml
• Potassium hydroxie solution, 500ml 
  
• Teacher’s manual