FIELD: chemical industry, more particularly, manufacture of light sensitive materials. SUBSTANCE: mercury is added to bismuth or antimony. Alkali metal is dissolved in liquid ammonia. Components are combined in closed system. Bismuth to mercury ratio in synthesis is at least 1:0.005 by weight. Antimony to mercury ratio is at least 1:0.001 by weight. EFFECT: lower temperature to room temperature and simplified equipment of the process. 3 cl, 4 ex
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