litmus paper
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English
[edit]Noun
[edit]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.
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Further reading
[edit]- litmus paper on Wikipedia.Wikipedia