DIN ISO 18901:2012-07

This document (ISO 18901:2010) has been prepared by Working Group ISO/TC 42/WG 5 "Physical properties and image permanence of photographic materials" of Technical Committee ISO/TC 42 "Photography", the secretariat of which is held by ANSI (USA). The responsible committee is NA 149-00-01 AA "Fotografische Medien" ("Photographic media") at the Entertainment Technology, Photography and Cinematography Standards Committee (NVBF). Experts of Working Committee NA 149-00-01 AA have actively taken part in the preparation of ISO 18901:2010 and prepared the German translation. ISO 18901:2010 is one of a series of International Standards dealing with the physical properties and stability of imaging materials. To facilitate identification of these International Standards, they are assigned a number within the block from 18900 to 18999. This document establishes the specifications for photographic films intended for the storage of records. This International Standard identifies certain hazards to permanence attributable to the chemical or physical characteristics of processed film and provides methods for evaluating them. Some of these are inherent film characteristics, some are related to the chemical processing procedure and some are influenced by both factors. However, storage conditions can also have a pronounced influence on film permanence. The essential requirements for longevity are proper storage temperature and humidity as well as protection from the hazards of fire, water, fungus, and atmospheric pollutants. ISO 18901:2010 is applicable specifically to films with a base of safety cellulose ester or polyester having silver-gelatin emulsions, processed to produce a black-and-white silver image by negative or full-reversal processing. It applies to film processed using a monobath that includes thiosulfate as the fixing agent, followed by a conventional wash. It also is applicable to silver films given a stabilizing treatment by partial or full conversion to silver sulfide, silver selenide or gold. This document is applicable to films having ultrasonic or dielectric (induction-heated) splices. It does not cover films with splices made of adhesive tape or solvent-type spIices. This International Standard is not applicable to films with chromogenic black-and-white images, colour images of any type, or to films with a magnetic recording track. It does not apply to films with silver images produced by dry or thermal processing or by diffusion-reversal processing. It is not applicable to films that have been processed by a monobath using means other than a thiosulfate-type fixing solution. It is not applicable to films where the silver salts are removed by means other than thiosulfate solutions. This International Standard is not applicable to films to which lacquers have been applied.