Description: Watch how we make invisible Beatles’ autographs visible with Reflectance Transform Imaging, a technique for forensic document examination.
Description: [caption id="" align="alignright" width="221" caption="At the turn of the century, visitors are entering and leaving the United States National Museum Building, now Arts and Industries Building, via the North Entrance, c. 1900, by Unidentified photographer, Photographic print, Smithsonian Institution Archives Record Unit 95 Box 32 Folder 8, Negative Number:
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