[pure-silver] Re: fixer question - wash water xchg rate
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 3 Jun 2008 17:59:27 -0700
----- Original Message -----
From: "ERoustom" <eroustom@xxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, June 03, 2008 5:31 PM
Subject: [pure-silver] Re: fixer question - wash water xchg
rate
Thank you Richard for you generosity here, and in other
forums.
Elias
Thank you. The fact is that I enjoy it:-)
or film is washed in standing water the hypo will form a
cloud at the surface and
Just to be clear I mean the surface of the emulsion not
the surface of the container. In re-reading this it occured
to me that this might be open to confusion.
If there was no boundary to the container the hypo would
form a cloud of diminishing concentration that would just
keep spreading. The process would continue infinitely but
the rate would eventually become very slow. Where the volume
of water in the container is limited it will reach
equalibrium where the concentration is essentially the same
thoughout the body of the water and in the emulsion (this is
not quite academically correct but close enough to describe
what happens in practice) and diffusion will stop. The sort
of overnight soaks in still water recommended by some
writers a few years ago is along this model. Its ineffective
for washing and can damage the support.
Ryuji Suzuki warns about some of the stuff in old
literature, its a good warning. I have also come to the
conclusion that a lot of photo chemistry even in modern
popular literature is alchemy not chemistry and is often
just plain wrong.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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