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what is natural indicator?

Indicators are substances which gives colour change on change of pH. These are called acid-base indicators. They are usually weak acids or bases, but their conjugate base or acid forms have different colors.They are of two types i)Natural 2)Synthetic.

Natural pH Indicator is  prepared from natural substances (from plants, insects etc). Example - Litmus, Turmeric, red cabbage, etc.

Litmus is commonly used acid -base indicator. It is  a water-soluble dye extracted from certain lichens, turns red in acid and blue with alkaline materials. 

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the indictaor which are obtain from plants and animals

for ex. litmus is obtian from lichen plants

 
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A natural indicator is a solution that changes colour at different pH levels, however these indicators are dissimialr to common indicators such as phenolphtalein as natural indicator solutions are dirived from chemicals from oragnic materials such as carrots, berries and beetroot
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Nature provides us withpH indicatorsin the form of plant pigments known as antocyanines, which change color over different pH ranges, depending on source. The indicators derived from red cabbage and red beet are two examples.

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