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The agent is a "thiosulfate." There are two in use.
The one we all started out on, because the other is more expensive, is sodium thiosulfate. It comes as a powder you add to water, stir until it dissolves then add more water to make the recommended amount. There's normally some potassium alum in it to harden the Gelatin (fixers for color work don't need this as the emulsion is prehardened in manufacture) and some acetic acid to act as a stop bath.
The one we all should be using is ammonium thiosulfate. It's a liquid so it's easier to mix, it works faster and it's easier to wash out of the emulsion. It also contains hardeners and acids.
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Hypo is a reducing agent when combined with Na.
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While I was in photography class in high school, we used to go into the dark room and put pennies in the fixing agent trays. The copper would attract the silver that was left behind in the trays due to the developing process. The longer you left the copper in the tray, the more silver would be attracted to it. Works with other metals as well. Hope this helps.
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Is the element silver widely used in photography?
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