From: Judy Seigel (jseigel@panix.com)
Date: 03/07/02-11:05:27 PM Z
On Thu, 7 Mar 2002, Gregory W. Blank wrote:
> I believe I can, Sabattier effect is akin to the Mackie Line effect(edge
> effect) where as there is a sharp cut off between smooth transitions of
> tonality. Noticeable where dark and light areas meet. That is you have
> smooth change of tone on both sides of dark vs light up until the dark and
> lighter areas abruptly meet.
>
> I had a teacher who stated that it is much harder to produce the reversal of
> tonality with papers that have a less abrupt toe to shoulder transition
> (less contrast) Fewer papers are available that are a true grade 5 which he
> believed was important to get the Sabbattier effect.
>
Gregory, your teacher was probably right about the high grade for
solarizing *in the days when they had graded paper* but the part about the
edge effect is wrong, as shown by Stevens & Norrish in "Border Effects
Associated with Photographic Reversal Processes," The Photographic
Journal, January 1937. (Tho none of this seems to address the warm vs
cool paper issue, which was original question.)
Even the reigning current "expert," Wm Jolly, spouted that edge effect
business until relatively recently (along with some other "rules" my tests
also showed not true). I learned about the Stevens Norrish research from
the bibliography of Walker & Rainwater's "Solarization," the best
bibliography on the process (if not the only) til that date. At the time,
NY Public library Photo Annex had the original Photographic Journal in
paper, crumbling a bit, but surprisingly intact, and marvelous to hold.
Now probably in a landfill somewhere, and contents only on microfiche,
which turns to red dot even as I write. (Am I off topic yet?)
Anyway, to cut the suspense, the effect is caused by halation -- as is
proved quite easily once you know to look for it -- in fact, you can get a
"mackie line" in the middle of an area of even density, by covering half &
re-exposing, assuming you're doing wet on wet. As I'd seen a hundred times
before reading their report, but hadn't, so to speak, integrated. Once you
read that, if you've done much solarizing, all sorts of other anomalies
fall into plavr.
This is explained at greater length (along with updated Rainwater formula)
in P-F #2, which is how I found the G.W.W. Stevens & R.G.W. Norrish
reference so quickly. (Under "Bibliography: Theory," page 16.) Did you
think I had that in my head all this time?)
best,
Judy
>
> >
> > Yes, there is: no one ever answered my question of why doesn't warmtone
> > paper sabattier well???? OR, is this even true???? What would be the
> > scientific reason it doesn't work, or is this a fallacy? Judy, I know you
> > do sabattier--do you know, or anyone else??
> > Chris
> >
> >
>
>
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