Potassium Permanganate Convection in Water

Potassium permanganate, also know as potassium manganate (VII), is used as a dye to show the motion of the water when it is gently heated.

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CAUTION: Safety goggles should be worn as a Bunsen burner is used and potassium permanganate in its solid form is an oxidiser, harmful if swallowed and harmful to aquatic life.