Photo: Kristýna Maková, Radio Prague International
Czech scientists have developed a unique “invisible stamp” that could help identify the owners of rare documents or works of art that got lost or stolen. The stamp is not detectable to the human eye and can only be deciphered by an X-ray fluorescence spectrometer.
Historical documents in archives are usually marked with a classic metal or self-inking stamp with the name of the relevant institution.
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Author: Ruth Fraňková