A review on the progress of photography in the year of 1963 about cameras, light sources, sensitive materials, new photosensitive systems, theories of photographic sensitivity, processing, sensitometry, cinematography, color photography, scientific photography and photolithography.

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In the 4 th report, determination of photographic stabilizers such as 5-Hydroxy-7-methyl-triazolopyrimidine, 5-Hydroxy-6-bromo-7-methyl-triazolopyrimidine and 5-Hydroxy-7-methyl-pentazaindene. was carried out.
These good photographic stabilizers do not form a silver salt in photographic emulsion and found to have medium silver potential.
In this report, the micro-separation and photometrical determination methods of mercapto compouds which form a silver salt in photographic emulsion were described.
Among them 5-sorts of mercapto compounds were isolated from photographic emulsions as follow.
Photographic emulsion was washed with water and precipitated by hot ethanol repeatedly.
Residue (AgX and mercapto compound Ag Salt) was dissolved in Sodium thiosulfate solution (pH 5), then free mercapto compound was extracted with ethyl ether.
Quantitative separation in μg order of mercapto compound from other additional agents in photographic emulsion was carried out by the use of cellulose or Sephadex ion exchanger adsorbents column chromatography and paper chromatography then resulted mercapto compound was determined photometrically.

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In the analysis of developing agents, few have ever experimented the method of correct analysis about microscopic sampling material in a short time.
Our research is on the method of crystalline analysis: We made testing solutions out of developer and crystallized them under the fixed conditions, That method of crystalline analysis was done by observing (through a microscope) crystallizing-forms and measuring crystallizing-characteristics.
This report shows us the result of the analysis of developing agents.
By that result, we have found that we can try qualitative and quantitalive analysis from the crystallizing apparatures of constant temperature and pressure (MAS No.2), correct, errorless deta the use of microscopic sample.
The conditions for crystallization are as follows;
Temperature: 20±0.1C°
Vacuum trade attainable: 2 cm. Hg.
Subject: 0.01ml.

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The methods were investigated which were capable of separately giving reduction sensitization, and Sulfur sensitization to the stage of the second ripening of the photographic emulsion. The emulsion used contained a small quantity of gelatin and was treated with benzen sulfonyl chloride as a precipitating agent, so the effects of natural gelatin on the emulsion were considered as negligible, or this emulsion was regarded as inactive. Therefore, Sulfur Sensitization and silver ripening which improves Wood's method were independently examined. Then, several noted addition agents, which are 5-methyl-7-hydroxy-1, 2, 4-triazolo [2, 3-a] pyrimidine [I], 5-methyl-7-hydroxy-1. 2, 3-triazolo [4, 5-d] pyrimidine [II], benztriazole [III], 6-nitrobenzimidazole (IV) and 1-phenyl-5-mercapto-tetrazole [V], were incorporated in the emulsion and their effects were obserbed.
In the reduction sensitization, [I] and [II] showed the inhibition effect with slight desensitization.
In th sulfur sensitization, [I], [II] and [III] showed the inhibition effect, [III] accompanied by desensitization.
The effects in each sensitization procedure of the compounds described in the previous and present papers are as follows.

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