Scientists in France have createdpaper that can carry secret messages.In visible light,the paper is indistinguishable from regular paper and users can read,write or erase messages using three different wavelengths of UV light.
The functionalised paper,made byFrançois-Xavier Felpinfrom the University of Nantes,and colleagues,containscoumarinmolecules attached to the paper's cellulose fibres.Exposing the paper to UV light with a wavelength of 340nm causes coumarin to react and create cyclobutane dimers.These dimers are invisible under visible light,but fluoresce under a UV lamp.
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M.d'Halluin,J.Rull-Barrull,E.Le Grognec,D.Jacquemin and F.-X.Felpin
Chem.Commun.,2016,
52,7672-7675
DOI: 10.1039/C6CC02915A
DOI: 10.1039/C6CC02915A
