Staples and paper clips are removed. Newspapers are ironed to remove creases that might obscure text or cause shadows under the camera lights. Targets are filmed to identify the materials on the film. Other targets include the resolution chart, title or file information, and copyright information. Completely prepared newspaper issues are placed between boards and taken to the filming area.
Polyester is more stable and is the recommended preservation base.
Acetate is chemically unstable. Over time, the acetate base deteriorates emitting an gas that smells like vinegar. Most library microfilm is filmed at an 18x reduction ratio. Most newspaper film is 21x because of the large page format. Most 16mm microfilm is 34x.