[pure-silver] FW: Re: Emulsion hardening for reversal processing of 35mm B&W film
- From: "Mike Kirwan" <mkirwan@xxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 31 Oct 2004 20:10:03 -0800
Just joining this thread, late, as I thought I had subscribed some weeks
ago...
I used a number of the formula and procedures that Dignan published many
years ago. They were very simple..
The first developer was:
Water
Calgon - 2.0 grams
Metol - 6.0 grams
Sodium Sulfite - 50 grams
Hydroquinone - 6.0 grams
Sodium Carbonate - 60.0 grams
I then decided this was a little too much work, so I made up a liter of
standard D-76, diluted it 1:1, added 2.0 grams of Calgon and 20 grams of
carbonate. Development time was 8 minutes..worked just fine.
- Mike
-Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Jordan Wosnick
Sent: Sunday, October 31, 2004 7:28 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Emulsion hardening for reversal processing of
35mm B&W film
Richard Knoppow wrote:
> What reversal formulas are you using?
Richard,
The formulas I am using are actually based somewhat on posts you
made in rec.photo.darkroom over the last few years. However, as a
first developer I am using a cobbled-together concoction based on
HC-110B 'spiked' with sodium carbonate to increase activity and
with sodium thiosulfate as a silver solvent. It works well
tonality-wise but your and Nick's posts have got me thinking that
I have maybe brought the alkalinity too high with the quantity of
carbonate I am using.
My rationale in desiging this developer was to use off-the-shelf
HC-110 as a starting material and keep the home-brew to a
minimum. Ilford's documents on reversal processing basically use
paper developer as a base for a reversal first developer, with
added thiosulfate as a silver solvent. I was trying to emulate
this with my HC-110B brew, using extra sodium carbonate to
compensate for the relative weakness of a film soup vs. a paper
soup.
My permanganate bleach is of a standard formula. Bleach clearing
is accomplished with a sodium metabisulfite solution (around 3%
w/v) and 'redevelopment' uses a thiourea solution made alkaline
with sodium carbonate. This gives a nice cold brown tone on Pan F
Plus.
I will try cutting down on the sodium carbonate in my first
developer and increasing dev time to compensate and will report
back on the condition of the emulsion. I realize that modified
D-19 or even Dektol are the standard reversal first dev's (as per
Richard's many posts on r.p.d) but I would like to get this to
work, while avoiding an extra hardening step if I can.
Jordan
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