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What are some natural acid/base indicators?

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Many flowers, fruits and vegetables contain chemical substances that change color in solutions of different pH. acid or base natural indicator, such as hibiscus, turmeric, red cabbage, and some other kinds of plants. Many indicators have been extracted from plants.
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Litmus,Alizarin ,Cochineal,Anthocyanin,Logwood,Curcumin( turmeric yellow),Esculin .
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3 YEAR EXPERIENCE IN TEACHING CHEMISTRY FOR IITJEE AND BOARDS

Many flowers,fruits,vegtables are natural indicators. One such example is rose anthocyanins.
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