litmus paper

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  • noun

Words related to litmus paper

unsized paper treated with litmus for use as an acid-base indicator

References in periodicals archive ?
However, the classical symphonies remain as litmus papers for accuracy and intonation, especially in the string sections, where they are guaranteed to expose deficiencies.
Some might wonder, for example, how natural the use of thermometers, litmus papers, and calendars really is.