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What are natural indicator? what changes to acidic and to bases

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Natural pH indicators are extracted from plants or plant compounds like purple cabbage, litmus, beetroot, Tumeric, china rose.
In acidic medium, Tumeric does not change its colour but changes colour in basic medium from yellow to red.
Purple cabbage turns from purple to green in a base and purple to red in acid.
China rose changes it's colour into green in basic solutions and magenta in acidic solutions.


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