Archived posting to the Leica Users Group, 2001/11/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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