36 C.F.R. § 1230.14 What are the filming requirements for permanent and unscheduled records?
Title 36 - Parks, Forests, and Public Property
(a) General requirements. (1) Apply the standards in this section for microfilming of: (i) Permanent paper records where the original paper record will be destroyed or otherwise disposed of; (ii) Unscheduled paper records where the original paper record will be destroyed or otherwise disposed of; and (iii) Permanent and unscheduled original microform records (no paper originals) produced by automation, such as computer output microfilm (COM). (2) Do not destroy permanent or unscheduled paper records after microfilming without authorization from NARA on a SF 115 (see §1230.10(a)). (b) Film stock standards. Polyester-based silver gelatin type film that conforms to ANSI/NAPM IT9.1—1996 for LE 500 film must be used in all applications. (c) Processing standards. Microforms must be processed so that the residual thiosulfate ion concentration will not exceed 0.014 grams per square meter in accordance with ANSI/NAPM IT9.1–1996. Follow processing procedures in ANSI/AIIM MS1–1996 and MS23–1998. (d) Quality standards—(1) Resolution—(i) Source documents. Determine minimum resolution on microforms of source documents using the method in the Quality Index Method for determining resolution and anticipated losses when duplicating, as described in ANSI/AIIM MS23–1998 and MS43–1998. Perform resolution tests using a ISO 3334-1991 Resolution Test Chart or a commercially available certifiable target manufactured to comply with this standard, and read the patterns following the instructions of ISO 3334–1991. Use the smallest character used to display information to determine the height used in the Quality Index formula. A Quality Index of five is required at the third generation level. (ii) COM. Computer output microforms (COM) must meet the requirements of ANSI/AIIM MS1–1996. (2) Background density of images. The background ISO standard visual diffuse transmission density on microforms must be appropriate to the type of documents being filmed. The procedure for density measurement is described in ANSI/AIIM MS23–1998. The densitometer must meet with ANSI/NAPM IT2.18–1996, for spectral conditions and ANSI/NAPM IT2.19–1994, for geometric conditions for transmission density. (i) Recommended visual diffuse transmission background densities for images of documents are as follows: (ii) Recommended visual diffuse transmission densities for computer generated images are as follows: (3) Base plus fog density of films. The base plus fog density of unexposed, processed films must not exceed 0.10. When a tinted base film is used, the density will be increased. The difference must be added to the values given in the tables in paragraph (d)(2) of this section. (4) Line or stroke width. Due to optical limitations in most photographic systems, film images of thin lines appearing in the original document will tend to fill in as a function of their width and density. Therefore, as the reduction ratio of a given system is increased, reduce the background density as needed to ensure that the copies will be legible.
Title 36: Parks, Forests, and Public Property
PART 1230—MICROGRAPHIC RECORDS MANAGEMENT
Subpart C—Microfilming Standards
§ 1230.14 What are the filming requirements for permanent and unscheduled records?
------------------------------------------------------------------------ Background Classification Description of document density------------------------------------------------------------------------Group 1 High-quality, high contrast printed book, 1.3-1.5 periodicals, and black typing.------------------------------------------------------------------------Group 2 Fine-line originals, black opaque pencil 1.15-1.4 writing, and documents with small high contrast printing.------------------------------------------------------------------------Group 3 Pencil and ink drawings, faded printing, 1.0-1.2 and very small printing, such as footnotes at the bottom of a printed page.------------------------------------------------------------------------Group 4 Low-contrast manuscripts and drawing, 0.8-1.0 graph paper with pale, fine-colored lines; letters typed with a worn ribbon; and poorly printed, faint documents.------------------------------------------------------------------------Group 5 Poor-contrast documents (special 0.7-0.85 exception).------------------------------------------------------------------------
------------------------------------------------------------------------ Density Minimum Film Type Process Measurement Min. Max. Density Method Dmax\1\ Dmin\1\ Difference------------------------------------------------------------------------Silver Conventional Printing or 0.75 0.15 0.60 gelatin diffuse------------------------------------------------------------------------Silver Full Printing 1.50 0.20 1.30 gelatin reversal------------------------------------------------------------------------\1\Character or line density, measured with a microdensitometer or by comparing the film under a microscope with an image of a known density.
