From: Carl Weese (cweese@earthlink.net)
Date: 08/23/02-01:41:39 PM Z
Shannon,
Films with low filmbase-plus-fog density and a long straight shoulder (the
two frequently go together) will readily reach contrast levels in normal
developers that exceed even the needs of Pt/Pd or POP-silver. Kodak Tri-X
sheet film, Ilford FP4 Plus, TMax 100, and to a lesser extend TMax 400 are
all good examples. Develop 75% longer than you would for silver printing,
and you're in business.
Films with a heavy fb+f and/or an early and resolute shoulder resist
reaching high contrast, long-scale density ranges appropriate for Pt/Pd. HP5
Plus and Bergger BPF are good examples. You can get either of these to
produce a sufficient range by finding just the right developer, but they
aren't "naturals" at it.
---Carl
--
web site with picture galleries
and workshop information at:
http://home.earthlink.net/~cweese/
----------
>From: Shannon Stoney <shannonstoney@earthlink.net>
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: negative intensification
>Date: Fri, Aug 23, 2002, 1:04 PM
>
> Carl wrote:
>
>> Many alternate processes require negatives with more contrast than "normal".
>> Some films can easily reach the needed level of contrast simply by extending
>> development, others do not respond as well.
>
> What films are known for being responsive to longer development?
>
> --shannon
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