A pure silver bromide 0.55µm core/shell emulsion of high internal sensitivity and low surface response was evaluated for its covering power and speed characteristics when the shell was removed in a 0.05M sodium thiosulfate etching bath following exposure. The etched core/shell emulsion was chemically developed and compared with the 0.36µm AgBr core alone at approximately constant developed silver weight per unit area at maximum density. It was observed that the etched core/shell emulsion displayed ~0.44 Log H units greater speed than the core alone when both were examined at approximately the same covering power.
Library of Congress Subject Headings
Images, Photographic; Photographic emulsions
Francis J. Evans
Cynthia G. Jones
Harry E. Roberts
Bishop, Julie C., "Covering power and speed characteristics of silver bromide core/shell emulsions etched with sodium thiosulfate solution" (1988). Thesis. Rochester Institute of Technology. Accessed from
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