Name two natural indicators and two human made indicators

China rose, turmeric paper natural indicators. Phenothelene, Acid
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Phenothelene and acid are human made
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Red cabbage and Grape juice are examples of natural indicators.
Litmus paper and phenolphthalein are examples of human-made or man-made indicators. 
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China rose and litmus and next methly orange and phenolphthalein
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Name
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