Standard Quality of Photographic Chemicals

Abstract

Photographic Processing inherently involves chemical operations which require adequate purity of the chemicals to attain a high standard of photographic quality. As a result, it has been found desirable to set up standards of purity for “photographic grade” chemicals to meet the requirements of the various sensitive materials and processes. These chemicals fall into groups according to their use or chemical nature : developing agents, alkalies, sulfites, restrainers and antifoggants, fixing agents, acids, hardeners, and a group of miscellaneous chemicals.