From: Joachim (joachim@microdsi.net)
Date: 08/31/00-06:47:31 AM Z
I had also tried contrast reduction for litho with Farmer's diluted and
found results so erratic that I abandoned it. Can you tell us what
Soermarko's low contrast developed is, and something about it? Thanks.
Joachim
> -----Original Message-----
> From: Judy Seigel [mailto:jseigel@panix.com]
> Sent: Wednesday, August 30, 2000 9:48 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: PRE DEVELOPMENT BLEACHING
>
>
>
>
> On Thu, 31 Aug 2000, Rod Fleming wrote:
>
> > Hi Bob
> >
> > I think you are talking about selective latent image management
> techniques,
> > shortened to SLIMT,or the Sterry technique . With reference to
> prints, this
> > allows, in effect, for the contrast range of the paper to be
> modified- in
> > other words graded paper can be used as a sort of multigrade.
> >
> > The original Sterry method used a dichromate bleach but this
> was revised by
> > the photographer David Kachel who developed a new version which
> uses very
> > dilute potassium ferricyanide (which is used in Farmer's
> Reducer etc) for a
> > period of between 1-3 minutes between exposure and development. The real
> > advantage of the technique is that it is _selective and
> proportional_. It
> > bleaches the most exposed areas the most.
>
> I used the method for lith film... an excellent way to lower contrast
> while getting good continuous tone for an enlarged negative. Mostly I used
> it on large sheets of Agfa (I think it was Agfa -- green box) direct
> duplicating -- high contrast in its native form (I'd come into a box of
> 20x24). It worked very well -- and I have a folder of notes somewhere or
> other I planned to use for an article in the "Negative thinking" section
> of P-F..... haven't yet because so many other damn goodies.
>
> Kachel may have the whole thing on his web site now (doesn't everybody
> have everything on their website?) but I got it from an article (maybe
> 2) he had in Creative Camera & Darkroom Photography or whatever the name
> of that magazine before it became Photo Techniques.
>
> For lith film the correct dilution of the ferricyanide solution turned out
> to be VERY VERY weak... like 1/2% or less... What I didn't understand at
> the time was that such a weak dilution would have to be used one-shot (I
> was quite new at all of it), so my results were erratic -- one good one
> and one where it didn't "work." As I say, I figured that out in
> retrospect. But the method made a lot of sense for the contrasty
> duplicating lith available at the time -- whether it would be as useful
> for pos-neg lith I don't know ... probably as much or more control by
> using Soemarko's low contrast developer for the positive, then neg from
> that.
>
> Judy
>
> .................................................................
> | Judy Seigel, Editor >
> | World Journal of Post-Factory Photography > "HOW-TO and WHY"
> | info@post-factory.org >
> | <http://rmp.opusis.com/postfactory/postfactory.html>
> .................................................................
>
>
>
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