Preservation

DNT [MPA-R6]

Record Type: Film Output from Motion Picture Film Source

Expected Use: Reproduction Master

Product Name: DNT (Duplicate Negative Track) [MPA-R6]

Product Purpose: The goal of this product is to serve as a master for distribution copies to satisfy most customer requests as well as to protect preservation elements from loss, theft, and mishandling. This product is the next best physical condition copy to the preservation master; therefore this product may substitute for the original record if the original record is no longer viable.

Nature of Source Material: 35mm or 16mm positive soundtrack elements, including MPT (Master Positive Track) or composite elements, where there is a need to ensure that all significant auditory information is carried forward. In some cases, an optical sound laser film recorder is used to output a DNT from a preservation-quality WAV (Waveform Audio File Format) file (Motion Picture Film Maximum Capture - Soundtrack Audio Data WAV [MPD-P6]). The WAV file may be captured from a MAG (Magnetic Track) element or an optical element.

Film Stock: Kodak 2234(35mm)/Kodak 3234 (16mm)

Other Information:

  • Separate sound track elements may be combined with visual elements to make a composite element.
  • This product is usually kept on site in a climate-controlled storage environment and retained to generate distribution copies.
  • This product is known internally as the “Intermediate copy” or “I copy” and usually has a yellow color swatch 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

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.

Rationale

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. Selected image adjustments such as color correction and density correction are routinely performed during the reformatting process.

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