A series of emulsions (fine, medium and coarse) was precipitated by double jet addition. The surface area of each emulsion was determined by adsorption of l,l'-diethyl-2,2’-cyanine in varying amounts and measurement of spectral reflectance, and the electron micrograph of each emulsion was taken. The emulsions were sensitized with differing concentrations of thiosulfate sensitizer and for various digestion time. The relationships between grain surface, grain size, and sensitizer concentration were determined by combining the optimum results of three individual experiments. From the sensitometric properties, the relation between grain size and optimum concentration of sensitizer was determined. Also the relationships between grain size and maximum sensitivity, and between fog and optimum speed were determined. The results showed that the rate of growth of sensitivity and fog increased with increasing thiosulfate concentration and grain size, and the optimum sensitizer concentration was independent of grain size. Also it was indicated that fog began to rise when the optimum speed was reached.

Library of Congress Subject Headings

Photographic emulsions

Publication Date


Document Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Carroll, Burt


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