Abstract
Bath temperature, duration, and composition were the primary variables analyzed to find an optimum combination of speed gain and low mean fog-level for Eastman Kodak IV-N emulsions. Speed gains of 14 to 20 can be realized by 3- to 6-min bathing in a water–alcohol solution containing 6% ammonia, at bath temperatures from 6° to 10°C, for exposure times of 5 min. Equivalent speed gains can be obtained by using pure water baths. However, if the alcohol is left out of the baths in the ammoniating procedure, the speed gains can be doubled.Hypersensitized IV-N emulsions are found to have a very small reciprocity failure, compared to untreated plates. The speed gains are presented for other infrared emulsions which have been hypersensitized by this method. Hypersensitized infrared emulsions can be stored up to three months at dry-ice temperatures (−57°C) without loss of speed gain or increase of fog level.
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