State Grid Microfilm Answers

What is the difference between microfilm and microfiche?

Microfilm is a roll film, and microfiche is a sheet film: either may contain negative or positive images, but negatives are more common. A microcard, like any photo print, is a photosensitive paper card, while a microprint is simply ink printed on a card. An aperture card is a microfilm image or cell mounted in a punch card.

What are the different types of microfilm rolls?

Microfilm rolls come in two standard sizes: 16mm and 35mm. The images in these rolls can be master copies, duplicates, positives, or negatives. Proper storage of microfilms is a necessity to protect the collection. If the cellulose nitrate-based film is not stored properly, it will become flammable and pyrophoric.

What is a microfilm reel?

Microfilm is a roll or spool of film with sequential frames of images. These film reels look similar to rolls of movie films. Microfilm rolls come in two standard sizes: 16mm and 35mm. The images in these rolls can be master copies, duplicates, positives, or negatives. Proper storage of microfilms is a necessity to protect the collection.

Is polyester based microfilm a low preservation risk?

Polyester-based microfilm is a low preservation risk. The paper card on which the microfilm is mounted will deteriorate differently depending on the type of paper used. Common Size(s) 7 ⅜" × 3 ¼" card containing one frame of a 35mm microfilm or several frames of a 16mm film. Background

What is vesicular microfilm?

Courtesy of the University of Mary Washington, Simpson Library.i Synonyms Kalvar; Thermal microfilm Description Vesicular microfilming is a duplication process intended for use as service copies. It contains a diazonium salt coating that is sandwiched between two polyester layers.

Which microfilm is best for storage?

Silver-gelatin black-and-white on polyester is the only microfilm recommended for preservation, since it boasts a 500+ year life expectancy under proper storage conditions (as outlined by ANSI standards). Microfilm Storage Particulate air pollutants are the source of scratches and abrasions.