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Paper print
Paper prints were an early mechanism to establish the copyright of motion pictures by depositing them with the Library of Congress. Thomas Alva Edison’s company was first to register each frame of movie film onto a positive paper print, in 1893. The Library of Congress processed and cataloged each of the films as one photograph, accepting thousands of photocopies of films over a twenty-year period.
The unintended but fortunate other outcome is that while the actual films and negatives of this period decayed or were destroyed, the paper prints sat ignored and more-or-less preserved. When this deposit policy ended in 1912 and actual film prints were registered and immediately returned to the copyright holder, many films in the following three decades were lost forever because their original elements (for example, Nitrate film) were too unstable for any lasting preservation or conservation. Paper prints, though, came with their own unpredictable nature, bringing migration challenges that rival the difficulties involved with the analog/digital conversions of today.
==Physical aspects==
Paper prints were the positive opaque copies of their transparent film negative source. Just like film wound on a film core, the paper print was also tightly wound in the same way. Most accounts of the paper prints collection never mention the chemical composition of the photographs, but archivists at Ohio State University〔http://publications.ohiohistory.org/ohstemplate.cfm?action=detail&Page=0078138.html&StartPage=138&EndPage=140&volume=78¬es=&newtitle=Volume%2078%20Page%20138〕 who received one of the restoration printers used for the conversion project refer to these photographic prints as existing on bromide photographic paper. No specifications could be found on the composition of bromide paper of the time, but one manufacturer today is Kentmere. Their bromide paper “features a conventional double weight fiber-base, coated with a neutral tone bromide emulsion…Glossy unglazed surface only. The double weight paper is approximately 276 g/m² and a thickness of approximately 260 μm.”〔Kentmere Photographic. (2005, February 10). ''Bromide technical data sheet.'' (version ). Retrieved April 11, 2008, from http://www.kentmereusa.com/〕 Photos of the paper on cores have a density that look very much like the films would, although there are no specifications on film of the time. Motion picture film was not standardized in the early years, and therefore, neither were their paper copies.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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