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An Experimental Comparison Of Emulsions Of The Same Type Of Different Iodide Levels, Seilay Wong
An Experimental Comparison Of Emulsions Of The Same Type Of Different Iodide Levels, Seilay Wong
Theses
Single run neutral type iodobromide emulsions of 1, 5 and 10 mole % were made similarly. On development to 0.7 gamma with Kodak developers D23 and DK50, it was found that the 10% iodide emulsion had faster speed than the 1% iodide emulsion but yet its granularity was no greater than the 1% iodide emulsion. There is no evidence that the performance in D23 as compared to DK50 was improved with increasing iodide percentage.
Sensitometric Study Of Io-Bromized Daguerreotype Plates, Mark Stebbins
Sensitometric Study Of Io-Bromized Daguerreotype Plates, Mark Stebbins
Theses
This research deals with a study of speed and contrast of daguerreotype plates that receive varying levels of sensitizing to the fumes of iodine, then bromine, and finally, a second iodizing. This sensitizing operation along with mercury development and gold gilding are characteristic of the process in its most improved state. Statistical analysis reveals how iodizing and bromizing affect speed and contrast. A field study was conducted to relate the sensitometric data to images produced in the camera. The experiment suggests an exposure index of .05 for the optimum in speed. This would correspond to an exposure of roughly 1 …