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An Investigation Of The Mechanism Of Emulsion Stabilization By 4-Hydroxy-6-Methyl-1,3,3a,7-Tetraazaindene, Eddie Rising
An Investigation Of The Mechanism Of Emulsion Stabilization By 4-Hydroxy-6-Methyl-1,3,3a,7-Tetraazaindene, Eddie Rising
Theses
There is considerable speculation in literature as to the mechanism of photographic emulsion stabilization by 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindene, (Aza). Aza is important as a stabilizer because, unlike the heterocyclic mercaptans, it causes no desensitization when the emulsion is processed in the commonly used MQ developing agents. The mercaptans are strongly adsorbed, whereas Aza is weakly adsorbed on silver halide. Therefore, there has been speculation that the stabilization mechanism of Aza is distinctly different from that of the mercaptans. For this work, Aza was tested as an antifogging agent and development restrainer along with KBr, as a reference, in two developers which function …
Design, Fabrication And Evaluation Of A Monochromatic Sensitometer, Jay Johnson
Design, Fabrication And Evaluation Of A Monochromatic Sensitometer, Jay Johnson
Theses
An intensity scale monochromatic sensitometer was constructed using a Bausch and Lomb single-pass diffraction-grating monochromator as the dispersing device. A ribbon-filament tungsten lamp was used to supply the radiant energy to the monochromator. The instrument was calibrated 2 radiometrically and was shown to have a maximum irradiance of 10 ergs/cm 2 2 at 425 nm, 43.7 ergs/cm at 550 nm and 26.1 ergs/cm at 700 nm. Exposure is accomplished by transporting the film and step tablet past a slit at a constant velocity. Several film velocities and slit widths are available to produce exposure times ranging from 0.003 to 2.0 …