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What is an Indicator
Indicators are substances which show a change in colour when brought in contact with acids and bases.
The most common indicator used in the laboratory is the litmus. It is extracted from lichens and is available either in the form of solutions or in the form of strips of paper known as litmus paper. Litmus paper is either red or blue in colour. It changes colour depending upon whether the compound is an acid or a base. Blue litmus paper turns red under acidic conditions, and red litmus paper turns blue under basic conditions.
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