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# What is Indicator and Litmus Solution?

**Indicators **are substances that change colour when they are added to acidic or alkaline solutions. Litmus, phenolphthalein, and methyl orange are all indicators that are commonly used in the laboratory.

Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator and called **Litmus paper.**

It used to test materials for acidity and basicity.

Blue litmus paper turns red under acid conditions, and red litmus paper turns blue under alkaline conditions.

Neutral litmus paper is purple in colour.

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