[pure-silver] Re: shot of a print
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 10 Aug 2007 13:04:07 -0700
----- Original Message -----
From: "Russ Gorman" <rusty57@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, August 10, 2007 8:40 AM
Subject: [pure-silver] Re: shot of a print
On Aug 9, 2007, at 8:58 PM, Eric Nelson wrote:
Russ,
When you say "weak fixer", are you refering to fixer
that is reaching exhaustion or the dilution?
Eric
I initially meant near exhaustion, but I note that you use
Kodak rapid fix which can be mixed to different dilutions
for different applications,filmRC,Fiber etc. (1:4 or 1:9
are common dilutions, if I remember right).
I've used Ilford Rapid fix (Hypam)
When using Ilford, you definitely want the 1:4 for fiber
print work. I can't remember the Kodak routine. I'm sure
you know this stuff, and of course it's easy to exhaust
solutions when you simply don't start with enough total
volume for the number of prints being processed or as
someone else pointed out- too much carryover of developer
from the other trays.
Russ Gorman Photography
Portland Oregon
<http://www.russgormanphotography.com>
Kodak Rapid Liquid Fixer and Hardener is nearly identical
to Ilford fixer if you leave out the hardener (comes in a
separate bottle). Some people find rapid fixer works too
fast for paper at film strength so there is an alternative
dilution, essentially film strength diluted 1:2 to extend
the time. Acidified Ammonium Thiosulfate fixer is also a
mild bleach so overfixing can result in a loss of shadow
details. In fact, rapid fixer with added Citric Acid is a
recommended bleach for removing dichroic fog. Neutral or
alkaline rapid fixer does not have the bleaching property.
Sodium Thiosulfate fixer also will bleach metallic silver
but the time required is hours so its not a problem in
normal use.
Sodium Thiosulfate fixer will fix out most paper
emulsions in about 2 minutes but more time may be needed to
reach halide in the Baryta layer. Dave Valvo can expand on
this. Rapid fixer will fix out most paper emulsions in 30
seconds to 2 minutes.
Ammonium Thiosulfate fixer is less affected by fixer
reaction products so it has a greater capacity than Sodium
fixer. However, I think a two bath system is still wise
practice with it.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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