turmeric contains tartaric acid but it is considered a natural indicator why

Turmeric does not contain tartaric acid. Tartaric acid is present in tamarind, grapes, bananas.
An indicator is a substance that gives different colours in acidic , basic and neutral solutions. Turmeric is yellow coloured in acidic and neutral solutions and red in basic solution.
Turmeric powder is obtained from stems of turmeric plant, it is a natural indicator. 

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