[pure-silver] Re: holes in emulsion and temperature
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Wed, 5 Dec 2007 14:19:51 -0800
----- Original Message -----
From: "Shannon Stoney" <shannonstoney@xxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, December 05, 2007 2:06 PM
Subject: [pure-silver] holes in emulsion and temperature
It suddenly occurred to me today that maybe the holes in
the emulsion of my recent negatives (120 roll film) might
have happened because the stop could have been colder than
the developer. Could that be a factor? My darkroom is in
the garage and sometimes in winter the solutions get
pretty cold out there, even in Houston. I make sure the
developer is warm, of course, but I don't worry too much
about the stop and fix. But maybe when the cold stop hits
the warmer negative, it has a bad effect on it. Could
this be the case?
--shannon
Some very old books advise having all solutions exactly
the same temperature but this is a left-over from the 1920s
when emulsions were very soft and tended to reticulate
(wrinkle) is subjected to much temperature variation or to
even moderate temperatures. Modern films are very hard in
comparision, in fact, some, like the T-Max series, are
hardened like color films to withstand 100F processing. In
any case a couple of degrees difference in temperature will
make no difference. Nor will gas generation in the stop bath
cause pin-holes for the same reason. In addition, gas is
generated only if the developer contains a carbonate and
most modern developers do not. The consern in the old days
was mostly about reticulation, not pin holes. Its very hard
to reticulate modern film even for a special effect.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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