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Abstract
Investigations of hypersensitization (increasing the sensitivity of non-exposed silver halide coatings) through treatment with a solution ofZn(II)-EDTA (complex ofZn(II)-with ethylene-diaminetetraacetic acid) are presented. This reagent is shown to be an active hypersensitizer of silver chlorobromide coatings at concentrations from 5X 10-5M to 10-4M and a suitable concentration of gelatin in the solution. Hypersensitizing ready coatings is found to bring about nearly the same net result as sensitizing the emulsion prior to precipitation. for a chemical-ripening time of 60 min. Highly sensitive fog-free coatings are produced in the presence of this reagent.