Record Type Film Output from Motion Picture Film Reversal, Negatives and Prints
Expected Use Preservation Master
Product Name DNT [MPA-P6]
Product Purpose

The purpose of this product is to mitigate risk for loss of information. This product is reproduced according to established industry standards and can substitute for the original record if the original record copy is no longer viable.

Nature of Source Material

35mm or 16mm soundtrack elements including MPT and MAG where there is a need to ensure that all significant auditory information is carried forward.

Film Stock

Kodak 2374 (35mm) and Kodak 3234 (16mm).

Other Information
  • Separate sound track elements may be combined with visual elements to make a composite element.
  • This product is placed in a cold storage (on or off site) environment and retained for the long term.
  • This product is created from the most original film copy.
  • This product is not accessed directly unless the reproduction master is damaged or destroyed or otherwise compromised.
  • This product is used to create reproduction master elements. It is never accessed directly by researchers and only sent to vendors under certain circumstances.
  • All 35mm and 16mm MAG are output to 35mm DNT.
  • This product has been known as the “P copy” and usually has a red color block on the film can.
Quality Control Density
  • Control strips are created on a sensitometer for each new processing batch and evaluated on the densitometer. Adjustments are made to the processing chemicals as needed to achieve the desired neutral visual density reading of “1” on the control strip.
Methylene blue testing (implementation underway)
  • ISO 18917 1999 compliance: Methylene blue testing to measure residual thiosulfate and its decomposition products is of use in appraising the adequacy of washing and therefore the permanence of the silver image on photographic films, plates and papers. Inadequate washing can cause a loss in image density and the formation of stain in low-density areas.

For the most part, film-based product specifications are dictated by the source material’s film element type. There is some flexibility however in regards to combining separate picture and soundtrack reels into a composite reel. This can be done for convenience or space management without any compromise to product quality. Selected image improvements such as color correction and density correction are routinely performed during the reformatting process.

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The U.S. National Archives and Records Administration
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