Microfilm Scanning and Microfilm Duplication
If you work with microfilm or microfiche, you should be thinking about a microfilm scanning conversion and work with digital images. Having original or duplicated film or fiche does make a difference in conversion quality.
Preservation standards require a master negative, a duplicate negative, and a positive copy.
Silver halide film results in a negative copy. Master negatives are kept in storage, and duplicate negatives are used to create copies, which available to researchers. Unfortunately, many clients send microfilm scanning companies these used and scratched versions!
Diazo film (ammonia dye) creates blue or black dye positive copies.
Vesicular film is created with diazo dye, and developed by heat. Generally microfilm conversions are poor.
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