Diazo Microfilm provides a photographic copy of the original document and requires a microfilm reader to use. Diazo is covered with a special coating, which protects the emulsion from being easily scratched and the film from being torn. It's widely used in libraries, government facilities and research centers, since it readily withstands daily use. Diazo copies are less expensive than silver halide microfilm. Silver Halide Microfilm also provides a photographic copy of the original document and requires a microfilm reader to use.
Silver film displays a grayscale image, which can be more readable than diazo film.
The silver film is also nearly one-third more expensive than diazo and is primarily used for archival purposes. Unfortunately, such use is not possible, as it is essential for Heritage Quest to receive remuneration for this costly venture. Heritage Quest and our parent company, SierraHome, have invested millions in research, development and production of these products that must be recouped if we are to continue funding such efforts. It is through this synthesizing process that we have generated a new product, which is fully protected by U.S. and International copyright law. Unauthorized use of these images is an infringement of that copyright.