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35 mm film 35 mm negatives acid ammonia aperture cards azo dye background density bromide ions camera film card file characteristic curve chemicals colour contact printing copy cost coupler densitometer diazo compounds diazo print diazonium compound draughtsman drawing number drawing office drawing sheet duplicate film electrical double layer electrons emulsion enlarger ensure equipment exposed exposure meter gamma give grain in-plant filming Kalvar key punch latent image legible lens less line density material maximum measured method microfilm system millimetre necessary negative density number of prints opacity original drawings output paper photographed possible printing section produce punch card quality control reading rear light recommended reduction ratio reflection density reprographic requisition resolution resulting negative roll of film sensitive sensitivity specks service house silver bromide silver ions slave cards solution space specks standard storage straight line portion temperature unitised cards usually vary