Plants as pH indicators

Colour changing plants – magic or science?

The objectives of the workshop are to determine the difference between acids and bases; to discuss the importance of studying acids and bases; to perform an experiment to identify acids and bases using plant-derived indicators.

This workshop is based on the properties of anthocyanins that have a different chemical structure in different plants. In particular, red cabbage contains a water-soluble pigment anthocyanin that changes to discrete colour when it is mixed with an acid or a base in pH range 2-12.


School visit




13 - 15 year olds