Archived posting to the Leica Users Group, 2002/06/17

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Subject: Re: [Leica] Old Neopan and Xtol
From: "Don Dory" <dorysrus@mindspring.com>
Date: Mon, 17 Jun 2002 07:12:58 -0400
References: <NABBLIJOIFAICKBIEPJJGEAAALAB.darkroom@ix.netcom.com>

Hi Austin,

I was,  in a nice way,  trying to suggest that some Neopan degradation
theory was unlikely to be the problem in the specific case you mentioned.

My real point was that high speed film tends to degrade by fogging.  Over
time background radiation(includes heat) increases Dmin so that in exposed
film you lose information in the increased noise of fog.  Therefore, if the
negatives are thin, it is almost certainly the developer or an error in
development.

It appears as well that you and Mark came up with the most likely
explanation that your developer was off.

As to storing Xtol, I mix the 5 liter pouches and store 4 liter's in an
accordion plastic tank.  It takes me something like 4 months to work through
that quantity with no evidence of activity loss.  Perhaps I have been lucky
in this as Xtol storage failures are legion: or perhaps Kodak has a quality
control problem as far too many people with loads of experience are having
difficulties with this developer.

Regards,

Don

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Replies: Reply from Mark Rabiner <mark@markrabiner.com> (Re: [Leica] Old Neopan and Xtol)
In reply to: Message from "Austin Franklin" <darkroom@ix.netcom.com> (RE: [Leica] Old Neopan and Xtol)