[pure-silver] Re: Fixing after indirect toning - a deeper question
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sun, 15 Jan 2006 15:04:12 -0800
----- Original Message -----
From: "Christopher Woodhouse" <chris.woodhouse@xxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Sunday, January 15, 2006 12:51 PM
Subject: [pure-silver] Re: Fixing after indirect toning - a
deeper question
Thanks for the clarification. Your recommendation seems to
confirm common
experience with the staining ability of brown toners.
Obviously if you only
partially indirect tone (for colour reasons) it is not
only risky as far as
residual undeveloped silver but also as it becomes almost
unrepeatable,
since the colour change in the tray is quite rapid.
On 15/1/06 20:04, "Richard Knoppow"
<dickburk@xxxxxxxxxxxxx> wrote:
For bleach and redevelop toners the only danger in
partial toning is from untoned and therefore unprotected
silver. The redevelopment bath will convert all of the
halide produced by the bleach into silver sulfide pretty
rapidly. The idea is that bleaching is carried out only part
way. This will bleach the image progressively in proportion
to the density. This can be used as a special effect by
itself or for double toning when theimage is treated with
another toner. Some toners will affect only the metallic
silver, a few, notably Gold toner, will tone both the silver
and silver sulfide.
Some bleaches will not completely bleach some paper. This
is the case with packaged Kodak Sepia Toner, which has a
hard time with many modern papers. Kodak recently came out
with another version, Kodak Sepia Toner II, which has a
modified and more powerful bleach.
Sodium Sulfide and Potassium polysulfide ("liver of
sulphur") of course, convert silver halide to silver
sulfide, they have some, but very little, effect on metallic
silver. If there is any halide left in the emulsion from
incomplete fixing it will be toned along with the desired
toning. For this reason a Sodium sulfide solution is used to
test for completeness of fixing. When a print (or film) is
properly fixed neither the test solution or a toner should
produce any highlight staining.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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