| abstract |
PURPOSE: To obtain silver colloid which is stably dispersed, by mixing a solution of L-ascorbic acid or its salt, to which protective colloid has been added, and an aqueous solution of silver nitrate wherein pH is regulated. n CONSTITUTION: An aqueous solution of protective colloid such as gelatine, gum arabic, protalbinic acid, etc. is added to an aqueous solution of L-ascorbic acid or salts of L-ascorbic acid, as reducing agents, which are agitated each other. On the other hand, silver nitrate is dissolved into water, where pH is adjusted at 0.1W7. Said two solutions are mixed at temperature of 100°C or less whereby fine colloid of silver in a state of stable dispersion can be produced. Further, protective colloid may be added to the aqueous solution of silver nitrate. n COPYRIGHT: (C)1989,JPO&Japio |