Miniaturized photographic document images arranged in horizontal
rows and vertical columns that form a grid pattern on a card-size transparent
film sheet. Fiche usually have a title readable without a magnifying
device. It is an inexpensive format for published materials large as
reports.
Microfilm:
A fine grain, high resolution photographic film used specifically for the
capture of document images. Microfilm is manufactured primarily in either 16
mm or 35 mm widths and in 100- or 215- foot long rolls. While all camera microfilm
has a silver halide photosensitive emulsion layer and this type of film is also used
for the production of working duplicates, several highly economical duplication films
exist such as diazo film (organic dyes) and vesicular film (bubbles).
