cartina tornasole

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Italian[edit]

Alternative forms[edit]

Noun[edit]

cartina tornasole f (plural cartine tornasole)

  1. (chemistry) litmus paper
  2. (figurative) irrefutable evidence, proof; smoking gun

Further reading[edit]

  • tornasole in Treccani.it – Vocabolario Treccani on line, Istituto dell'Enciclopedia Italiana