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There are two fixers. The old fixer is sodium thiosulfite. The good stuff is ammonium thiosulfite. When this stuff first came out, we all went to it for two reasons--it's packaged as a concentrated liquid, so it's quicker and easier to mix, and it fixes really fast, so you spend less time fixing. Later on we found out ammonium thiosulfate has an even more important benefit: it washes out of the emulsion a lot faster.

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16y ago

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