[pure-silver] Re: Chemical Fogging in Reversal Processing
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 14 Aug 2006 10:24:49 -0400
Funny you should ask now. There has been a rather lengthy thread on
APUG on chemical fogging for reversal. The only important points are
these. Kodak now uses a separate bath for this purpose for E-6 rather
than doing it during the second development as they did for the E-4
process. This bath consists of stannous chloride in a buffered acidic
solution of propionic acid. This bath is used before the second
developer after a wash to remove any remaining tin salt. There is no
reason why this bath cannot be used for B&W reversal. I would be
tempted to just buy this product as it is ~ $13 for enough concentrate
to make 5 gal of bath.
Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of John Banister
Sent: Monday, August 14, 2006 8:13 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Chemical Fogging in Reversal Processing
Hello,
I'm wondering if anyone has any experience they'd care to relate about
reversal processing of black and white film, and in particular about
using chemistry rather than light to fog the emulsion either as a
separate step or by using a fogging developer.
I've asked related questions of a couple of list members via private
email and on their recommendation I've obtained Grant Haist's two volume
book, _Modern Photographic Processing_. Chapter 7 in volume 2,
"Reversal Processing of Black and White Materials," answered any
questions I had and several I hadn't considered to ask. Since I have
also often learned
the answers
to questions I hadn't considered to ask by reading of the experiences of
others, I thought that I'd ask y'all if anyone has any B&W reversal
processing experiences you'd care to tell about. I've searched for
reversal
related posts
in the archives, but found little in the way of related experiences with
deliberate chemical fogging as part of reversal processing. I'm
aware that it's
often recommended to use light for the fogging, but I have the notion
that with
chemistry I could eventually learn to program it all into my
autoprocessor once
I have a method that works.
It'll probably be a year or so before I'll actually be doing reversal
tests with film, so please don't consider that I have any immediate
need. I'm still gathering information and letting it percolate in my
mind. Thanks for taking the time to read these words.
John Banister
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