OAR 166-025-0015
Technical Specifications for First-Generation 16 mm, 35 mm, and 105 mm Silver-Gelatin Source Document Roll Microfilm for Permanent and Long-Term Oregon Public Records
(1)
Microfilm Specifications: All security microfilm for long-term or permanent records shall be 16 mm, 35 mm, or 105 mm negative non-perforated silver gelatin type on a polyester base, as described in ANSI IT9.1-1996; Imaging Media (Film) — Silver Gelatin Type — Specifications for Stability. The film shall be at least 0.13 mm thick.(2)
Reels: Processed film shall be on storage reels which are chemically inert, in compliance with ANSI IT9.2-1998; For Imaging Media — Photographic Processed Films, Plates, and Papers — Filing Enclosures and Storage Containers, are sturdy, and have dimensions which conform to ANSI/AIIM MS34-1990; Dimensions for Reels Used for 16 mm and 35 mm Microfilm. The film shall be stored with the start target at the outer end in accordance with ANSI/AIIM MS23-2004P; Practice for Operational Procedures/Inspection and Quality Control of First-Generation Silver Gelatin Microfilm of Documents.(3)
Restrainers: Only acid-free, button tie paper bands in compliance with ANSI IT9.2-1998; For Imaging Media — Photographic Processed Films, Plates, and Papers — Filing Enclosures and Storage Containers shall be acceptable to restrain film on its reel.(4)
Enclosures: Film enclosures (containers) shall be inert black plastic.(5)
Quality Control-Inspection: Inspection and quality control data shall be recorded at the time the film is processed. A film inspection form is available from the Archives Division. First-generation (camera) film shall be inspected frame-by-frame for visible defects and missing documents. Inspection may be performed on a light table using an eye loupe for the frame-by-frame inspection and under a microscope for the inspection of resolution. The inspector shall wear clean, white, lint-free cotton gloves when handling the film. All inspection shall be performed in accordance with ANSI/AIIM MS23-2004P; Practice for Operational Procedures/Inspection and Quality Control of First-Generation Silver Gelatin Microfilm of Documents, Section 8. Security copies of film shall be free from scratches, gouges, blemishes, dust, dirt, or fingerprints.(6)
Residual Thiosulfate: All film shall meet the requirements for residual thiosulfate ion concentration as specified in ANSI IT9.1-1996; For Imaging Media (Film) — Silver-gelatin type- Specifications for Stability, Section 6.4. The maximum allowable thiosulfate ion concentration is .014 grams per square meter. Testing for residual thiosulfate ion concentration shall be done by using the Methylene Blue method in accordance with ANSI/ASC PH4.8-1985; For Photography (Chemicals)-Residual Thiosulfate and Other Chemicals in Films, Plates and Papers- Determination and Measurement, Section 5. This test shall be conducted within two weeks of film processing and may be performed at the processing site or by an independent laboratory. All test results shall be documented.(7)
Target Density: The aim point density shall be 1.00 ± .10. The acceptable density range on targets shall be .80 - 1.25. There shall not be more than a .20 density shift on targets in a single roll. Any roll which falls outside the acceptable .80 - 1.25 density range on targets shall be re-filmed. Density variation shall not be greater than .15 across a target. The plain white pages or acceptable density target photographed at the beginning and end of each roll of film shall be used as the primary density measurement targets.(8)
Reduction Ratio: The reduction ratio used shall approximately fill the image area across the width of the film as seen on the camera’s projected image area; the ratio shall not be less than 8:1. All edges of the document shall be visible in the image area. (See ANSI/AIIM MS23-2004P; Practice for Operational Procedures/Inspection and Quality Control of First-Generation Silver-Gelatin Microfilm of Documents, Section 3.6.) Reduction ratio changes within the same record series shall be avoided. If they are necessary, however, the change in ratio shall be identified by an informational target filmed immediately before each change.(9)
Resolution: Each roll of first-generation film shall be evaluated for resolution by viewing the standard ISO Resolution test chart (see OAR 166-025-0020 (Targets and Certifications) on Targets and Certifications) at 100X magnification. The smallest distinguishable test pattern must correspond to the correct reduction ratio as seen in Figure 1:(10)
Splicing: There shall be no more than six splices on security copies of film. Retakes shall include at least two pages preceding and following the pages to be refilmed. There shall be no splices between the technical target and the text. All splices shall conform to ANSI/AIIM MS18-1992(R1998); Splices for Imaged Film — Dimensions and Operational Constraints.(11)
Targets and Certification: All microfilm shall conform to the standards for targets and certifications set forth separately in these rules.
Source:
Rule 166-025-0015 — Technical Specifications for First-Generation 16 mm, 35 mm, and 105 mm Silver-Gelatin Source Document Roll Microfilm for Permanent and Long-Term Oregon Public Records, https://secure.sos.state.or.us/oard/view.action?ruleNumber=166-025-0015.