Re: Freezer Problems

[Russ Rosener <rrosener@xxxxxxxxxxxxxxx>]

> 
> Seen no research, but I've never had a problem.  Now I just gotta hurry
> and shoot that Konica that I thought was safe in the freezer!
> 
> I wouldn't worry about this, with the exception of open paper/sheet film
> boxes, where condensation might present a problem even if no real
> thawing occured.
> 
> Keep Cool,
> 
> Tom

I'd question the statemant that Konica IR kept in the freezer is
automatically "unusable after the expiration date." First off,
"unusable" can be a very subjective term. Konica IR should not be any
more unstable than a conventional black & white film. Just remember that
IR films are essentially panchromatic films coated with an extra IR
sensitive dye/emulsion layer. Why would the base fog increase more than
regular films? The only answer would be that it's more sensitive to the
UV spectrum, which it is not. It could also be the case if the film were
somehow "pre-exposed" after manufacturing. Then the latent exposure
would continue through physical development. 
	I have noticed that the "base fog" of Konica IR is higher than other
films even when brand new. I would want to see H&D curves of old vs, new
film before passing judgement


- -- 
Russ Rosener
Washington University, St. Louis
http://home.stlnet.com/~rrosener/Archaic_Cyberspace.html
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