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Recommendation 3.4: Technical Guidelines
Recommendation 3.5: Substitutes for Harmful Chemicals
Recommendation 3.6: Sharing Preservation Information
preservation screening hosted by the Association of Moving Image Archivists and be arranged in association with other technical and archival organizations. The new group might view and discuss a blind, random sample of recent preservation work or of specifically printed test material. The goal would be to increase communication about archival-quality duplication toward making film copies as true as possible to the originals.
Encourage development and acceptance of standardized technical guidelines for the laboratory duplication of black-and-white and color film of archival quality. It would useful to complement the subjective comparisons proposed in Recommendation 3.3 with agreed-upon technical guidelines and a common grading system for archival-quality copying. The National Film Preservation Board will help launch this effort through a survey of U.S. laboratories specializing in archival services in order to gather information on current practices in specific technical areas (for instance, frame-line stability or the exposure and processing of interpositives). Such data may point to the value of certain film stock improvements (for instance, YCM separations with improved panchromatic emulsions on a polyester base). The disputed question of whether archival copying onto acetate base should be abandoned in favor of polyester could also be productively discussed.
Encourage the development of substitutes for environmentally dangerous chemicals vital for film preservation. Archival-level laboratory work depends on quality methods and tools. At least two chemicals that may soon be banned in the United States appear essential to preservation copying as it is currently practiced. 1,1,1-trichloroethane, commonly employed for cleaning film, is scheduled for a federal environmental ban in 1995; perchloroethylene, a known carcinogen used in wetgate printing, may soon be added. No satisfactory substitutes have yet been identified and, without such chemicals, the quality of preservation copying of older American films will suffer. (Cleaning prevents dirt from being permanently printed into the copy; wetgate printing makes scratches and other flaws less visible in the copy.) Until alternatives are found, the National Film Preservation Board, working with national technical organizations, plans to seek an environmental exemption and to urge development of viable substitutes.
Lay the groundwork for sharing information on the surviving preservation elements of American film titles. A cooperative national preservation effort requires the capacity to exchange information in all areas. In order to prevent costly and unnecessary .replication of preservation copying and to assure that the best
8 Redefining Film Preservation