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The Use Of Thin Layer Chromatography (Tlc) In Qualitative And Quantitative Determinations Of Photographic Developing Agents (In Developer Solution) Using A Scanning Densitometer, Michael Gilbert
Theses
TLC was used, for qualitative and quantitative analysis of photographic developing agents hydroquinone, metol, phenidone, para phenylenediamine, para aminophenol, ascorbic acid and the oxidized species. Experimental conditions and procedures for reporting Rf values of the aqueous solutions of the developing agent were standardized. Quantitative TLC was done for hydroquinone. The density maxima obtained from the scanning densitometric trace of the eluted and visualized chromatogram was correlated to the concentration of the hydroquinone. Aqueous solutions of hydroquinone were prepared at four levels of concentration, three levels of pH and two levels of sodium sulfite concentration for quantitative analysis using TLC.
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 …