The Factors Involved in an Assessment of Radiographic Definition

Abstract

Desensitization of silver-digested emulsions¹ by optical sensitizers begins at much lower concentrations of dye than is the case with sulphur-sensitized emulsions. The degree of optical sensitization is not greatly affected by the method of digestion. Certain concentrations of dye fog a silver-digested emulsion; this effect can be simulated with an inorganic oxidizing agent, ferricyanide. It is concluded that dyes can bring about a rearrangement or complete oxidation of the “silver” produced in the grain by the chemical sensitization process of silver-digestion.