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Chemically sensitive paper used to indicate pH levels in colorless liquids.

Merriam-Webster Online Dictionary

litmus paper (noun)

unsized paper colored with litmus and used as an indicator

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Look up litmus in Wiktionary, the free dictionary.

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, used to test materials for acidity. In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue. In short, it is a dye and indicator which is used to place substances on a pH scale.^{[citation needed]}

Chemical structure of 7-hydroxyphenoxazone, the chromophore of litmus components

Litmus Paper (Wiktionary)

English

Noun

litmus paper (countable and uncountable, plural litmus papers)

(chemistry) paper containing a water-soluble pH indicator composed of a mixture of different dyes extracted from certain lichens. The resulting piece of paper is used to test materials for acidity, turning red when acidic and blue when alkaline.

Translations

Litmus Paper

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"Litmus Paper"

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