Shweta Jain
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Posted 6 year ago
What is the best natural indicator?
1 Answer(s)
Seema Kumari
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Posted 6 year ago Seema Kumari Gurushala Teacher Coach

Many plants contain their own indicators – turmeric, red cabbage juice and beetroot juice are three good examples. Other examples are tea and red grape juice. Hydrangea flowers are different colours depending on whether the soil is acid or alkali. In acid soil they are blue and in alkaline soil they are red.