litmus paper

Noun
  1. Unsized paper treated with litmus for use as an acid-base indicator (synset 114965780)
    is a type of: paper - a material made of cellulose pulp derived mainly from wood or rags or certain grasses
    substance holonym: litmus, litmus test - a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator

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