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Volume 32, Issue 1
Displaying 1-7 of 7 articles from this issue
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Noboru ITOH1969 Volume 32 Issue 1 Pages 1-6
Published: April 25, 1969
Released on J-STAGE: September 13, 2011
JOURNAL FREE ACCESSA review on the use of polarogrphy in the study of developing agents, development mechnism, antioxidants, color developers, stabilizer and antifoggant, spectral sensitizer, gelatine and analysis.View full abstractDownload PDF (879K) -
Hirokazu TSUKAHARA1969 Volume 32 Issue 1 Pages 7-12
Published: April 25, 1969
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIt was found that Thin-Layer Chromatography is useful as one of the methods to indentify the chemical structure of dye-foming developing agents.
The best results were obtained on silica gel layers among various adsorbents.
Diethylparamine, Droxychrome, CD-III and Agfa's dye-forming developing agent, the most popular ones, were most successfully separated when they were developed on a silica gel (WAKOGEL B-5) layer with diethylether.
The method of detection described in the present work is that the developed layer is sprayed with the aqueous solution of phenol and immediately with the ammoniacal solution of silver nitrate in the light room. Dye-forming developing agents are detected as bluish colored spots, while black-and-white deveroping agents appear as dark spots.
This experimental technique can be directly applied both to aqueous solutions of mineral acid salts of dye-formig developing agents and to color developers which are usually alkaline aqueous solutions.View full abstractDownload PDF (616K) -
Effects of Iridium Salts on Sensitivity of the Photographic Emulsion to X-raysHidemaru SAKAI, Shigeji BABA1969 Volume 32 Issue 1 Pages 13-17
Published: April 25, 1969
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSIt has been shown in the previous works that the addition of the very small amounts of hexachloroiridium complex at the precipitation stage of silver halide eliminates the high intensity reciprocity failure of the emulsion and increases its sensitivity at high intensity exposure. On X-ray exposure, a comparatively large amount of energy can be transfered to a single grain by the passage of a single electron. In this respect, X-ray exposures resemble the exposures of very high intensity light. Therefore it is expected that the sensitivity of the emulsuons to X-ray might be influenced by the addition of the iridium complex. In this paper the effects of the iridium complex on the X-ray sensitivity of the photographic emulsions are studied and compaired with the effects of lead and thallous salts which have been known as a sensitizer for X-ray emulsions. The analogous behaviors are observed on three kinds of the metal salts.View full abstractDownload PDF (2366K) -
The Adsorption of Adenine on Silver Halide CrystalsNoboru ITOH1969 Volume 32 Issue 1 Pages 18-21
Published: April 25, 1969
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe adsorption of adenine on silver halide crystals was studied by the UV absorption and IR spectroscopic method.
It was found that the resstraining effect of adenine, estimated by turbidity measurement, is directly connected with the adsorption of adenine to silver halide, and the adsorption of adenine on silver halide is not a physical adsorption, which is caused by Coulomb's or Van der Waals' force, but caused by aformation of co-ordination or salt with silver ion.View full abstractDownload PDF (448K) -
On the Benzazole DerivativesNoboru ITOH1969 Volume 32 Issue 1 Pages 22-26
Published: April 25, 1969
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe pH dependency of physical restraining effect of benzazole derivatives was studies by turbidity meas-urements.
It was found that the restraining effect of benzimidazole derivatives has two steps. The one is caused by co-ordination of nitrogen in the imidazole ring, and another is caused by salt formation with silver ion. The inflection point of pH-turbidity curves for the former appears in neutral or weakly acidic region and that of the latter appears in alkalin region.
Mercaptobenzimidazole shows different behavior from other imidazole derivatives at high pH region, especially, in low molecular concentration, but shows similar behavior in high molecular concentration.View full abstractDownload PDF (547K) -
Mitsunori ONO, Takao SATO, Tadaichi KUROKAWA, Narumi SUGITANI, Naoya S ...1969 Volume 32 Issue 1 Pages 27-31
Published: April 25, 1969
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSPhotographic sensitive layer should produce sufficient density with the least layer thickness. In order to satisf y this demand, gelatin must retain as much silver halide as possible dispersed in the emulsion. The limit of silver halide, dispersed colloidally without sedimentation, in a given quantity of gelatin may vary with gelatins.
The authors propose “colloidal retentivity” as a measure of this protective colloid power of gelatin against silver halide in the photographic emulsion. Colloidal retentivity is so defined as to show 100% when emulsion grains are well dispersed without sedimentation, while the more sedimentation, the les colloidal retentivity.
Two methods of the measurment of colloidal retentivity are introduced.
Colloidal retentivity as depending on the ripening temperature, rotation speed of a stirrer, silverhalidegelatin ratio and gelatin characteristics are studied.
Colloidal retentivity brings different information about the ripening as compared with the turbidity measurment. Colloidal retentivity during the ripening passes maximum and minimum points while turbidity increases monotonously.
The graingrowth mechanism is discussed on these results.View full abstractDownload PDF (625K) -
[in Japanese]1969 Volume 32 Issue 1 Pages 34-36
Published: April 25, 1969
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSDownload PDF (333K)
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