Archived posting to the Leica Users Group, 2001/11/07

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: Re: [Leica] Digital/polaroid
From: Henning Wulff <henningw@archiphoto.com>
Date: Wed, 7 Nov 2001 20:26:45 -0800
References: <42.1cea5ee5.2919ce02@aol.com> <42.1cea5ee5.2919ce02@aol.com> <5.1.0.14.0.20011107165059.00a5a2f8@swiftnet.com>

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.
>
>--
>To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html

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
- --
To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html

In reply to: Message from Teresa299@aol.com (Re: [Leica] Digital/polaroid)
Message from Teresa299@aol.com (Re: [Leica] Digital/polaroid)
Message from David Rodgers <drodgers@swiftnet.com> (Re: [Leica] Digital/polaroid)