PURPOSE:To obtain a life prolonging agent for cut flowers, having high concentration and excellent stability without requiring dechlorinated water such as distilled water, by dissolving a silver halide and a stabilizer comprising an inorganic acid and an antioxidant in an aqueous solution of sodium thiosulfate. CONSTITUTION:The titled agent consisting of 1-5pts.wt. silver halide, 10-50pts. wt. sodium thiosulfate and 1-20pts.wt. stabilizer comprising an inorganic acid such as sulfuric acid or an organic acid such as citric acid or a salt thereof and an antioxidant such as sulfite or vitamin C. The agent is prepared by dissolving 10-50pts.wt. sodium thiosulfate in 100pts.wt. water in the first place and dissolving 1-20pts.wt. stabilizer and 1-5pts.wt. silver halide in the aqueous solution to give a product. Facilities for distillation or desalting are not required by using the agent, a dissolving tank is miniaturized or number of dissolving tanks can be reduced, extreme simplification of facilities and reduction in production time and in operation amount are brought about, handling of preservation and transportation after production is facilitated and cost is also lowered.
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