Archived posting to the Leica Users Group, 2001/11/07
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At 4:54 PM -0800 11/7/01, David Rodgers wrote:
>Henning,
>
>A friend of mine owned a large photo chemical distributorship in
>Denver. The company lost power once during a winter storm. The
>building got cold enough that certain chemical separated. And I
>don't think it even got down to 32 degrees F. I can't remember
>exactly, as this was a number of years ago. But I do remember it
>ruined a number of high end solutions, and it was pretty costly.
>
>Dave
>
>At 10:48 PM 11/6/2001 -0800, you wrote:
>>The problem is that the chemicals that do the developing are in a
>>gel. You're not just freezing the film (and paper) which can stand
>>freezing, but you're freezing the developer/fixer in solution. When
>>you freeze stuff like this, different components freeze at
>>different temperatures and separate, and then the ingredients after
>>thawing either are separate from the those they should be
>>intermingled with, or are no longer in solution.
>
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You're quite right. Separation/crystalization can take place at
temperatures well above freezing, and returning them to solution has
to take place sometimes at very high temperatures, and sometimes
never. Use safe storage!
- --
* Henning J. Wulff
/|\ Wulff Photography & Design
/###\ mailto:henningw@archiphoto.com
|[ ]| http://www.archiphoto.com
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