English version

litmus paper

From Longman Dictionary of Contemporary English
Related topics: Chemistry
litmus paperˈlitmus ˌpaper noun [uncountable]  HCpaper containing litmus, used to test whether a chemical is an acid or an alkali
Examples from the Corpus
litmus paperThe use of litmus paper furnishes another example of such a transformation.In a drawer the litmus paper mused upon which way to turn.The litmus paper turned red when immersed in the liquid.
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