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On the clearing of emulsion plates

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Il Nuovo Cimento (1955-1965)

Summary

The effect of the addition of Ammonium Chloride, Ammonium Hydroxide, and Ammonium Sulphocyanide to the Hypo bath of different concentrations, on the clearing time of thin and thick emulsions (up to 1000 Μm) has been observed. In the case of thin emulsions no rise for higher concentrations has been found. A detailed study of the three baths, for different concentrations of Ammonium salts has been made, and the results indicate an optimum value for a particular temperature and thickness. The effects of the Ammonium baths on the developed grain size has also been thoroughly studied. The results have been discussed on the basis of the prevalent theory. The use of Ammonium Sulphocyanide is favoured in comparision to the other two salts.

Riassunto

Abbiamo osservato l’effetto dell’aggiunta di cloruro d’ammonio, ammoniaoa e solfocianuro d’ammonio al bagno d’iposolfito di differenti oonoentrazioni, sul tempo di chiarificazione di emulsioni sottili e spesse (fino a 1000 Μm ) Nel caso di emulsioni sottili si è riscontrato un aumento per le oonoentrazioni superiori. Si è condotto uno studio dettagliato dei tre bagni a differenti concentrazioni di sali di ammonio e i risultati indicano un valore ottimo per particolare temperatura e spessore. Si sono anche studiati dettagliatamente gli effetti dei bagni ammonioi sul calibro dei granuli sviluppati. Si sono disoussi i risultati in base alla teoria prevalente. L’uso del solfocianuro di ammonio è preferibile rispetto agli altri due sali.

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Prakash, Y., Ahamad, N. & Sharma, A.P. On the clearing of emulsion plates. Nuovo Cim 8, 717–730 (1958). https://doi.org/10.1007/BF02815251

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  • DOI: https://doi.org/10.1007/BF02815251

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