The ‘blue bottle’ experiment

Conical flask containing Conical flask containing methylene blue redox indicator with glass stirring rod

Source: © Shutterstock

In this demonstration, the redox indicator Methylene blue can be oxidised many times by shaking. Includes kit list and safety instructions.

Transform methylthioninium chloride (Methylene blue) from blue to colourless and back again by mixing it with glucose and shaking the solution, then letting it settle.

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