From: Ed Buffaloe (EdBuffaloe@UnblinkingEye.Com)
Date: 09/04/02-06:50:55 PM Z
Liam Lawless worked out a similar reversal process using Arista Ortho Litho
film and published it in Post-Factory Photography #2. The original,
unedited version of this article is available at
http://rmp.opusis.com/documents/reversal4.pdf. Subsequently I published an
article on the same process, which is at
http://unblinkingeye.com/Articles/NbyR/nbyr.html.
----- Original Message -----
From: <PhotonTom@aol.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, September 04, 2002 12:11 PM
Subject: Re: direct duplicating film
> I am not sure about Kodak's direct duplicating film in larger sizes,
but
> I know of two alternatives. Many (many !!) years ago I got the idea that
> radiologists might need duplicates of X-rays and I contacted a medical
film
> supply house and found that there was, indeed, an x-ray duplicating
material
> (would have to be direct duplication). I obtained some of it (Italian
> manufacture) and as I recall it was in 14X17 size and strictly ortho...
the
> old red light safelight worked fine. And it was v-e-r-y s-l-o-w, even
more
> so than the Kodak.
> I was using it to make enlarged (4x5) negatives from 2-1/4 and 35mm negs
for
> retouching purposes (commerical portrait appliction). Worked great, but
did
> require a 60-180 sec. exposure at 4x5... bigger would be slower. I also
had
> fun making multiple major enlargements until grain was like golf balls.
(10X
> three times=1,000X)
> The second technique I know (not tried by me, BTW) was to use large
> format litho film...expose it as a positive and "flash" the film (eg.,
give
> it a 10%-100% additional exposure with a diffuser over the enlarging lens)
to
> control contrast.... process it through the first developer, wash, then
> BLEACH then reexpose then redevelop (the now negative image left over
from
> the bleaching), rinse, fix, wash, dry. The technique was outlined in
> Professional Photographer by the technical editor, Don Emmerich, several
> years ago. His article demonstrated excellent contrast control and as a
the
> owner of a viable commercial studio it was a technique he used for real
> clients and real results. Should be worth the search.
> Cheers,
> Tom Crowe
> Thomas Crowe Studios-Photographic Arts
> "Lost in East Tennessee"
>
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