Making a pH indicator using red cabbage

A close-up photograph of a heap of red cabbages

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Try this class practical to make a pH indicator from red cabbage with your students. Includes kit list and safety instructions.

A pH indicator is a substance which has one colour when added to an acidic solution and a different colour when added to an alkaline solution. Many plant colouring materials in berries, leaves and petals act as indicators.

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