On 1/13/2010 5:53 PM Richard Knoppow spake thus:
> "David Nebenzahl" <(E-Mail Removed)> wrote in message
> news:4b4d47ea$0$14757$(E-Mail Removed) s.com...
>
>> Nothing earthshaking, just interesting.
>>
>> I keep a bottle of sodium sulfite concentrate that I use
>> for hypo clearing agent. Checked the bottle yesterday and
>> was surprised to find big chunks in the bottom. *Really*
>> big chunks. I guess they're big Na2SO3 crystals. They're
>> clear, like ice, not like salt. They're hard. One was so
>> big I had to shake and break it to get it out of the
>> bottle. Weird.
>>
>> They all redissolved easily after heating in a pan on the
>> stove.
>
> It would be interesting to know if this is crystalized
> sulfite or if it changed to sulfate. Sulfite absorbs oxygen
> from the air and eventually becomes sulfate. The more
> diluted it is the shorter the life. A pretty concentrated
> solution of sulfite should last quite a while but, of
> course, it will depend on the exposure to the air including
> the permeability of the container.
I guess it's time to toss that batch and mix some fresh. So what is the
effect of sodium sulFATE on film and paper, if any?
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