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Thanks, Ron. That might explain something that puzzled me a couple of years ago. A friend of mine who had given up film photography gave me one or two pounds of old sodium sulfite. At first glance, it didn't look quite right. Instead of the fine sugary look of sulfite, it had a rather floury appearance. I decided to give it a try anyway. It was very hard to dissolve, and the solution had a muddy look. I suspected that either my friend had somehow mislabeled the bottle and gave me something else, or the sulfite was some impure, technical grade. However, my friend was positive that it was analytical grade sulfite, bought from a reputable company.
I knew it was very old and hadn't been stored in optimal conditions, but I thought that the worst that could happen to sulfite over time would be to turn into a hydrated form.
So, I take it I might have had two pounds of sodium sulfate... 
Last edited by Vlad Soare; 01-05-2012 at 04:40 AM.
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Well, it is probably something like 80/20 Sulfite to Sulfate. It does not go bad with a rush, but rather with a whimper! And during the flip flop results are ambiguous.
PE
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