Abstract: There is disclosed a diazotype copier for deodorizing developed diazocopy material. The copier includes a light source for exposing the diazotype copy material and a developing chamber for developing the exposed copy material. After exiting the developing chamber, the developed material passes under a heating chamber which includes a heating element and means for providing a flow of air into the chamber, around the heating element, and across the developed copy material. The heating air releases the entrapped ammonia vapors from the developed copy material. Thereafter, the air, including the released ammonia vapors, flows toward and into a scavenging device which neutralizes the ammonia vapors.

Abstract: Apparatus for the elimination of noxious ammonia fumes associated with diazo copiers includes a plenum chamber disposed about the output aperture of the machine developer chamber. Vacuum means are provided to draw the ammonia laden air out of this chamber. Preferably this apparatus is used in conjunction with a novel filter connected between the chamber and the vacuum means. The filter comprises a filter body of a material such as corrugated paper having a plurality of longitudinal substantially parallel channels, the walls of which are impregnated with a material, such as phosphoric acid, which will react with ammonia to generate odorless end products. A granular layer impregnated with such a material may be disposed in contact with the output end of this filter body.

Abstract: In a diazo developer apparatus which includes a chamber, slightly larger than the film to be developed, having continuously circulating ammonia gas uniformly distributed in the film area, ammonia gas entry and exit ports, a temperature control device for the chamber, and elements in the chamber for preventing the film being processed from closing the exit port. The gas is derived from a container holding a predetermined amount of liquid ammonium hydroxide through which the gas exiting from the chamber is bubbled. The gas is derived from the container above the liquid level and fed directly to the chamber.