From: by way of Sandy King (stwang@clemson.edu)
Date: 07/21/01-10:47:09 AM Z
Carl,
I recall an earlier conversation with you regarding the *sneaky*
streaking phenomenon. Very curious. I have not experienced this, but
I don't do the heavy metal thing and it could result from a
particular spike of light you get with pt/pd.
Just out of curiosity, have you satisfied yourself that the problem
you had with print drums and ABC+ was not a result of some internal
defect in the film? I have seen some strange things on film
emulsions that had nothing to do with my processing technique.
Finally, I am really baffled that one can get decent results with
staining developers with smooth-walled drums like the Expert Drums
and from BTZS and home-made plastic tubes, which are also
smooth-walled. Intuitive logic would suggest that drums with ribs
that allow flow over the back of the film would perform much better
than the smooth-walled tubes where the film remains virtually glued
to the inside of the tube and little or no flow can take place.
Sandy King
>X-Time: <200107220132.f6M1WTp04725>
>Date: Sat, 21 Jul 2001 21:13:10 -0400
>From: Carl Weese <cweese@earthlink.net>
>Subject: Re: bromide drag
>To: alt-photo-process-l@skyway.usask.ca
>Reply-to: alt-photo-process-l@skyway.usask.ca
>X-Priority: 3
>Comments: "alt-photo-process mailing list"
>
>Sandy,
>
>In case I haven't mentioned it here, you also have to watch out for a
>'sneaky' streaking that only shows up in certain printing methods. That is,
>I've done large negs in ABC+ that looked perfect on a lightbox, printed fine
>in silver, but showed clear drum-rib-streaks when printed in platinum by UV
>light. Whether they would show up in other UV sensitive processes would take
>investigation.
>
>If this sounds really weird (it seemed weird when I first encountered it)
>there's an analogy to something I've seen with Newton rings. With smooth
>surface films (like Ilford's) my NuArc vac frame makes world class Newton
>rings when the pressure comes up, ruining silver prints. But when the print
>material is Pt/Pd, the rings are clearly visible to the eye, but don't
>print. They are apparantly invisible to the Pt/Pd paper, or to put it the
>other way, they exist at a wavelength the eye, and silver paper, sees, but
>the UV sensitive material does not.
>
>It could be that there are combinations of print drum/developer/film stock
>that will perform flawlessly, but I've never gotten reliable flaw-free
>results from the Jobo print drums and ABC+. Expert Drums, for the sizes they
>accomodate, have performed flawlessly for me. I'm just happy tray processing
>works so well.---Carl
>--
> web site with picture galleries
> and workshop information at:
>
> http://home.earthlink.net/~cweese/
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