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           Synchrotron-radiation phase-contrast microtomography (Italy, Elettra Trieste)
  tomography area 
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             Homogeneous glass    (healthy)
 
    Glass with porous structure   (silica gel layer)
 
    Viacryl coating   
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           The Viacryl takes the shape of the glass surface, whether it is altered or not. The thickness of the film varies. When it is well preserved, the adhesion is conserved.   
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