From: Anthony JAHN (Anthony.Jahn@wanadoo.fr)
Date: 07/20/01-03:42:19 AM Z
I found the article by chance some while ago - if it's the same - at this
adress:
http://www.phototechmag.com/previous-articles/nov99-weese/nov99-weese.htm
It's still there, and I refer to it often - Thanks! - but lately I have a
doubt about the ISO rating of HP5 in Pyro. Seems to me finally that 200 is
too low, and I'm tempted to go higher (320?), because the shadow density in
my negs seems a bit too dense. Easier to do that than double the print
exposure time for a palladium print?
Anthony
----- Original Message -----
From: Sandy King <sanking@hubcap.clemson.edu>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, July 17, 2001 3:29 PM
Subject: Re: pyro literature
> I would like to thank Judy for the complimentary remarks regarding my
> article on pyro developers that appeared in Post-Factory #4. Let me
> also direct your attention to an excellent piece on pyro by Carl
> Weese that was published in Photo-Techniques just a few months before
> my piece appeared in PF. I don't have on hand the full bibliographic
> citation for Carl's article but perhaps someone on the list does?
> Carl and I shared quite a bit of our research in preparing the two
> articles so there should be no surprise that we are in general
> agreement about most matters regarding pyro development.
>
>
> There is, however, one area in which my experience does not match
> that of Carl's, and that is in the use of ribbed tubes (of the color
> print development type) with pyro development. I have used these kind
> of tubes for several years, for developing 7X17 and 12X20 film and
> have never experienced any uneven development at the point where the
> ribs touch the film. My technique is very simple. Load the film in
> the tube, soak in plain water for 5 minutes, then develop for the
> required time on a rotating motor-base, lifting the tubes off the
> base every two minutes for about 10 seconds of vertical agitation to
> avoid bromide drag. Most of my development over the past several
> years has been with Pyrocat-HD, a pyrocatechin/phenidone developer
> described in PF #4. However, I have also developed film in the drums
> with both PMK and ABC+ without, so far as I can determine, any
> detrimental results.
>
> Finally, regarding Pyrocat-HD, I am now recommending the addition of
> 4g of EDTA per 1000ml of Stock Solution A. This does not impact
> developing times but with certain water conditions has proven to be
> *cleaner* acting.
>
> Sandy King
>
>
>
>
>
>
>
>
>
>
>
> >On Mon, 16 Jul 2001, christine wrote:
> >
> >> Steve Shapiro wrote:
> >> > Let me know if anybody wants toknow more about tray development by
> >> > inspection using pyro.
> >>
> >> I do, I do! I am about to embark on a Tech Pan/Pyro combo. I've never
> >> used either, but both stand out to me as media I would like to try
> >> from reading about their qualities. ..... I've read the Film
> >> Developing Cookbook and am about to read The Book of Pyro.
> >
> >Christine,
> >
> >Among best (I would say THE best, but it might sound immodest) on pyro is
> >Sandy King's article, "Mystery and Science of Pyro" in Post Factory #4.
> >This reviews, summarizes and UPDATES usage, by tank, tray, stand, &
> >densitometer, et al. Sandy's own invention, based on pyrocatechin, "the
> >other pyro" (he calls it Pyrocat-HD), apparently has enough advantages to
> >make folks adopt it, tho I don't know about T-Max.
> >
> >There's also Stuart Melvin's pyro on lith film and pyro points from
> >"Skeptics and Believers." Not to mention Liam's Fun & Games With Blue
> >Toner, Dallas Simpson on toning with tin, Bob Schramm on Daguerreotypy,
> >just about the entire history and practice of paper negatives & cliche
> >verre, and the legendary "Gold Flap" from this very list (this last
> >followed by reports from a couple of folks who did it and lived to tell
> >the tale, "live, from the gold field"). Plus, believe it or not, lots
> >more.
> >
> >And that's just Issue #3. E-mail me offlist & I'll tell you (and anyone
> >who asks) how to get it (or for that matter any P-F to date but #1 or
#2)
> >for cost of the postage as "free introductory copy."
> >
> >cheers,
> >
> >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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