a substance that turns red when it touches an acid and blue when it touches an alkali 石蕊（一种遇酸变红而遇碱则变蓝的物质） litmus paper 石蕊试纸
Oxford Collocations DictionaryLitmus is used before these nouns:- paper
Word OriginMiddle English: from Old Norse lit-mosi, from litr ‘dye’ + mosi ‘moss’.
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