Abstract
Abstract (1) The coagulation of silver halide sols which takes place when they were subjected to heating in an autoclave was studied. It was observed that the sols prepared by using an excess of potassium halide, especially the AgJ-sol in an excess of potassium iodide, were most stable against the action of heat. (2) The arsenic trisulfide sol from which hydrogen sulfide was removed shows noticeable coagulation at 180° and 200°C. This behaviour is quite different from that of the sol from which hydrogen sulfide was not removed. (3) The light absorptions of arsenic trisulfide sols, one which is free from hydrogen sulfide and the other containing hydrogen sulfide, were compared. No noticeable difference was observed.
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