A non-reversing duplicate film (containing diazonium salts) which forms an image when exposed to ultraviolet light and enveloped by ammonia.

In microform records, film containing images produced by exposing an emulsion of diazonium salts to ultraviolet light and then ammonia fumes for the purpose of copying a master microform. See also MICROFILM.

A relatively slow film composed of azo dies that, in the presence of strong light and ammonia vapors, is capable of creating an image. Diazo provides a positive image, black to black and white to white.

A type of microform in which the active component is a light sensitive diazo dye. It is recommended for duplication and use copies of microfilm since it is less expensive than silver halide film. However, it is not considered archival. and original filming should be undertaken using silver halide film.

A microfilm duplicating or copy film widely used for its durability and economy. Diazo film copies from camera film (Silver-Halide) when contact printed using ultraviolet light and developed in the presence of gaseous ammonia.