RhubarbThe demonstrator takes a stick of rhubarb, taking a bite out of it is a nice touch, and uses it to stir a solution of potassium VII manganate, which goes clear.

Rhubarb contains a chemical, oxalic acid, that reacts with the purple permanganate ions. Colourless manganese ions are formed.
This can be extended into an investigation (See Rhubarb Rhubarb!)

Rhubarb! Rhubarb! Rhubarb!

Rhubarb! Rhubarb! Rhubarb! - Risk Assessment

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