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Statistical Analysis Of Grain Growth Based On The Frieser-Eger Film On Development Kinetics, Noreen Vredenburg, Sharon Perry
Statistical Analysis Of Grain Growth Based On The Frieser-Eger Film On Development Kinetics, Noreen Vredenburg, Sharon Perry
Theses
Data were obtained from the Frieser-Eger1 film on development kinetics for initiation times and for total development times of individual grains (times of complete development) in a lithographic developer and in a hydroquinone developer with normal sulfite level. Approximate areas were computed for each grain. The purpose of this investigation was to compare the process of development at the two sulfite levels and to determine if there is a functional relationship between total development time and grain size. Different relationships were expected for the two types of developers. This data analysis permits a better understanding of the differences between lithographic …
Investigations In Post-Fixation Physical Development, R. Jerry, J. Nelson
Investigations In Post-Fixation Physical Development, R. Jerry, J. Nelson
Theses
The procedure outlined by Matejec, Photograpische Korrespondenz, 104, 153 (1968), fixation in a thiosulfate-sulfite solution to which AgBr has been added, followed by washing in 1% sulfite solution, and development in a metol-sulfite-AgNO3 developer, was tested on seven silver iodobromide emulsions, each of a different average grain size. Samples were exposed, and processed by chemical and physical development. Matejec’s results, equality of threshold speed with post-fixation physical and chemical development, could only be realized with a very fine grain emulsion and high intensity exposure. It was found that the efficiency of physical development, relative to chemical development, is inversely related …
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 …
Landscapes In Gum, Barbara Johnson
Comparison Of The Development Characteristics Of A Sodium Thiosulfate Monobath With That Of A Mercaptoacetic Acid Monobath, Richard Smith
Comparison Of The Development Characteristics Of A Sodium Thiosulfate Monobath With That Of A Mercaptoacetic Acid Monobath, Richard Smith
Theses
The development characteristics of mercaptoacetic acid monobaths were compared with those of sodium thiosulfate monobaths at varying fixing-agent concentrations. The following differences were noted: (1) it required four times more moles-per-liter of sodium thiosulfate than metcaptoacetic acid to obtain the same rate of fixation; (2) the mercaptoacetic acid monobath produced less silver than the sodium thiosulfate; (3) KODAK Panatomic-X Film developed in a mercaptoacetic acid monobath had a covering power greater than or equal to that produced by development in the same phenidone-hydroquinone developer without any fixing agent, whereas the covering power of the sodium thiosulfate monobath was less; (4) …
Tone Reproduction Of Small-Scale Images Using Lithographic Film Under Infectious And Noninfectious Developmental Conditions, Julian Lopez
Tone Reproduction Of Small-Scale Images Using Lithographic Film Under Infectious And Noninfectious Developmental Conditions, Julian Lopez
Theses
The tone reproduction curve of small-scale images on KODALITH film developed with KODALITH Super Developer were obtained by microdensitometry using a sinusoidal target of 64 percent modulation as a sensitometric tablet to produce images at spatial frequencies corresponding to screen rulings of 9 to 375 lines/inch. A similar series of exposures was processed with addition of sulfite to the developer to give essentially noninfectious development. Speed and contrast with KODALITH developer increased with spatial frequency; speed increased continuously by a small factor and contrast passed through a maximum (80 percent greater than for large area image) at a spatial frequency …
Spatial Interactions In Monobath Development, Gary Mcsweeney
Spatial Interactions In Monobath Development, Gary Mcsweeney
Theses
The sensitometric effects of varying developing agent concentration, fixing agent concentration, and pH in a monobath developer were studied with Kodak Tri-X Pan film. Three variables (gamma, base plus fog, and a shoulder density) were studied under varying levels of each of the factors. A factorial experiment was run and an analysis of variance (ANOVA) was used to determine whether or not each of the main factors and the two-factor interactions were significant. The higher order interactions were used as a measure of experimental error for the analysis. In the range of the factors being investigated, it was found that: …
Changing The Contrast Of Ektacolor Paper, Britton Hopkin
Changing The Contrast Of Ektacolor Paper, Britton Hopkin
Theses
Practical effects (contrast, fog, maximum density, and scale index) on the characteristic curves of Ektacolor paper were found for variations in the concentrations of sodium carbonate, potassium bromide, 6-nitrobenzimidazole nitrate (Kodak AF-71), color developing agent (Kodak CD-3), pH, and citrazinic acid (CZA) in an Ektacolor developer used on the Kodak model 11 drum processor. The effects of pH, citrazinic acid, potassium bromide were found to be significant while the effects 6-nitro benzimidazol nitrate and CD-3 were significant only in isolated insidences.
Color Monobath Development, John Plumadore
The Effects Of Sludge On The Image Quality Of A Particular Film-Monobath Combination, Alfred Dilascia, Ronald Hubbard
The Effects Of Sludge On The Image Quality Of A Particular Film-Monobath Combination, Alfred Dilascia, Ronald Hubbard
Theses
Sludge is considered by many to be a factor limiting the usefulness of monobaths. A particular film-monobath combination was tested for the effects of sludge on sensitometry, granularity, and acutance. It was found that the presence of sludge did not alter the sensitometric characteristics; however, through solution usage, the acutance and granularity decreased. Removal of the sludge by filtration during usage resulted in improved image quality over the comparison solution in which sludge was allowed to accumulate.
The Electrolytic Regeneration Of A Phenidone-Hydroquinone Developer, Howard Hall
The Electrolytic Regeneration Of A Phenidone-Hydroquinone Developer, Howard Hall
Theses
An attempt was made to regenerate a phenidone -hydroquinone developer. During the electrolysis the concentration of all the components remained constant with the exception of bromide, which was released as bromine from the anode. The possible use of the apparatus to remove bromide and reduce the replenishment rate in a continous processing system is suggested.