[pure-silver] Re: toning the new Adox MCC 110
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 24 Jul 2010 18:31:09 -0700
----- Original Message -----
From: "Dennis P" <dlp4777@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, July 24, 2010 11:39 AM
Subject: [pure-silver] Re: toning the new Adox MCC 110
On Jul 24, 2010, at 11:23 AM, Richard Knoppow wrote:
Bromide in the developer can affect the image color,
usually the
more bromide the finer the crystals and the more yellow
the color.
However, Ira Current, of Ansco, found that very large
amounts of
bromide added to the developer would _cool_ the tone
given by
bleach and redevelop Sepia toner, its described in his
patent USP
2,607,686. Its also true that the emulsion has a strong
effect on
the color produced by a toner, for instance, the
polysulfide toners
(like Kodak Brown Toner) now recommended for protection
of
microfilm images will produce a sepia color on most
printing paper
but results in a blue shift on microfilm which has a very
fine
grain structure.
--
So you are saying that using more Potassium Bromide in the
developer
makes the print color warmer because it makes the silver
crystals
smaller. Is that the same as to say that Potassium
Bromide makes a
finer grained print? Would that be the same case in
processing more
normal films (than microfilm)? It will make a finer
grained negative?
thanks
Dennis
Bromide is a fine grain agent but it also reduces speed
significantly. This is not so important in paper but is for
film and there are better ways to get fine grain development
for film. An important fine grain agent not mentioned much
in the literature is sodium chloride (table salt). This is
the main ingredient in Microdol-X and Perceptol. In general
the use of large amounts of bromide in film developers is
discouraged because it tends to destroy part of the latent
image.
I don't know the theory of Ira Current's discovery, of
course it is somewhat the opposite of what the original
poster wanted, namely stronger red-brown effects from
Selenium toner. Indirect toner, the bleach and redevelop
kind, tends to produce too yellow a color on warm tone
paper. What Current found was than by adding very large
amounts of bromide to an active developer warm tone paper
could be toned to a "cool" or bluish brown with indirect
toner. I have never tried this but it comes from a reliable
source and probably works.
At the time Ansco made a number of originally AGFA
papers including a couple of very warm toned ones like
Indiatone so such a method might have been valuble to them.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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