cartina tornasole

Italian

Alternative forms

cartina di tornasole, cartina al tornasole (proscribed, but less common)

Noun

cartina tornasole f (plural cartine tornasole)

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

Further reading

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

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