A review on the progress in photography in the year of 1960; about cameras, lenses and camera accessories, sensitive materials, theory of photographic sensitivity, development and fiixing, enlarging and slide projecting, cinematography, scientific photography and color photography.

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Concerning the performance of adsorption experiments of the photographic addition agents on silver halide grains, the establishment of quantitative micro-analysis of these agents is required. For this purpose the application of the Feigl's iodine-azide reaction was proposed by this author. This method is performed by dropping the iodine-azide solution into the addition agent solution at the constant rate until the colour change is observed, and by measuring the dropped quantity of iodine-azide solution. However concerning the practical use of this method, several subjects must be previously studied. This paper is described about the dependence of the iodine-azide reaction upon the pH of solution and upon substitued radical of homologue compounds.

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The influence of the presence of silver ion upon the iodine-azide reaction of photographic addition agents (sulfur-containing compounds), such as thiourea, sodium sulfide, and sodium thiosulfate, were investigated. Silver nitrate was employed as an agent to provide silver ion. The pH of the mixture of each addition agent and silver nitrate was variously changed. Some of the solutions were not allowed to stand after their preparations and others were allowed for a certain time and the difference between them was also investigated. It was observed that the reactivity of iodine-azide reaction for the above first two compounds decreases with the addition of silver ion. Remarkable difference was recognized at pH 5 between the reactivity of the thiourea solution which was not allowed to stand and that which was allowed for one hour. However, no remarkable difference was observed at pH 9 and 11 for thiourea, and at any pH for sodium sulfide. The iodine-azide reaction phenomena of sodium thiosulfate by existence of silver ion was very complex.

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