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Forgive me if I'm wrong. It's been fifteen years since I made thiosulfate. I believe the key ingredients were yellow sodium polysulfide and sodium sulfate. Yellow sodium polysulfide is made by dissolving flowers of sulfur into NaOH.
Ammonium thiosulfate works better but needs copper to catalize the reaction to dissolve gold. It should be noted that gold sulfides will dissolve into polysulfides anyway. Also small amounts will dissolve into just plain NaOH.

[QUOTE="Dr. Poe, post: 116602, member: 21456"] Forgive me if I'm wrong. It's been fifteen years since I made thiosulfate. I believe the key ingredients were yellow sodium polysulfide and sodium sulfate. Yellow sodium polysulfide is made by dissolving flowers of sulfur into NaOH. Ammonium thiosulfate works better but needs copper to catalize the reaction to dissolve gold. It should be noted that gold sulfides will dissolve into polysulfides anyway. Also small amounts will dissolve into just plain NaOH. [/QUOTE]

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