Red cabbage indicator

Red cabbage indicator

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Credit: MARTYN F. CHILLMAID/SCIENCE PHOTO LIBRARY

Caption: Red cabbage indicator. A simple indicator can be made from the pigment anthocyanin in red cabbage by liquidising the leaves in water and then filtering the solution. Its normal purple colour turns green in alkali and red in acid.

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Keywords: acid, alkali, ammonia, anthocyanin, chemical, chemistry, citric acid, color, colour, dye, green, indicator, lemon, no-one, nobody, purple, reaction, red, red cabbage, school science, science education, solution

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