[pure-silver] Re: FW: Sepia toning & Potassium Bromide & Ira B Current
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 20 Nov 2007 21:53:22 -0800
----- Original Message -----
From: "titrisol" <titrisol@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, November 20, 2007 4:29 AM
Subject: [pure-silver] Re: FW: Sepia toning & Potassium
Bromide & Ira B Current
Developer also plays an effect in the final tones.
Ethol LPD produced colder chocolate when used more
concentrate, have not tried it with Dektol.
C.Breukel@xxxxxxx wrote: FYI
Its evident that the structure of the original image
affects toning considerably. Since the structure is affected
by the developer its not surprizing that this should be so.
In general, the finer the original silver grains the
more effective a toner will be. Also, the orginal image
color is mostly decided by the grain structure, the finer
the grain the yellower the image color. so, warm tone papers
tend to tone more effectively in most toners. For the most
part the yellowish (or brownish) image in warm tone papers
will tend to produce more yellow browns from sepia toners.
The bleach and redevelop toners, also called indirect
toners, tend to produce more yellow colors on any paper than
direct toners like polysulfide (like Kodak Brown Toner) or
Hypo-Alum types, so they are preferred for use with cold
tone papers which may not tone to a desirable brown using
direct toners. OTOH, they may produce too yellow a color
when used with warm tone paper.
The old rule of thumb was that adding bromide to a
developer would result in finer grained and therefore warmer
toned images which would also tone warmer. Current's
experiments, as reported in his patent, indicate that if
very large amounts of bromide is added the reverse happens,
at least in respect to the image resulting when the paper is
toned.
Modern paper emulsions seem to be quite different from
those of the time the patent was issued so they may not
behave the same way. Nonetheless, its an interesting thing
to know about and I am glad Cor tried it and reported to us.
Its also evident that various developing agents and the
activity of the developer also affect the original image
color and probably also the color of the toned image.
Also, I should point out for clearities sake that not
all toners produce brown images. We are discussing mainly
those which convert part or all of the image silver to
silver sulfide. Other toners, for instance the various gold
toners, also are affected by the color of the original
image. Gold, used by itself, for instance, produces a blue
image. On cold tone paper the effect is mainly to intensify
the image slightly but the blue color becomes more evident
on warm tone papers, the warmer the original tone the bluer
the toned image. Selenium toner behaves in much the same way
except the resulting image color is purplish brown.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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