The Solubility of the Silver Halides in Ammonium Thiosulphate. The identification of the Solids in Equilibrium with Solution

Paper presenied at the “Congres International de Science Photographique” held in Paris in September 1965.

Abstract

The solubilities of silver chloride, bromide and iodide in ammonium thiosulphate solutions at all concentrations up to saturation, are reported. Crystalline solids separating from the solutions supersaturated with respect to silver halide were examined by photomicrography, X-ray diffraction, infrared spectroscopy and chemical analysis. Of the nine compounds isolated, seven are ammonium argentothiosulphate halides. Three of these are new compounds. One of the latter has a known copper analogue which was also prepared for comparison purposes. The significance of these findings to the fixation process are discussed.

Notes

Paper presenied at the “Congres International de Science Photographique” held in Paris in September 1965.