[pure-silver] Re: Chemical Fogging in Reversal Processing
- From: Jordan Wosnick <jwosnick@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 18 Aug 2006 12:04:14 -0400
John Banister wrote:
After first development and bleaching, then I can chose to either fog
the film and redevelop
or to proceed directly to sulfide or selenium toning, and these
operations can be done in the
same manner for all films because they are carried out to completion.
Is this approximately
correct?
Hi John,
It is correct for sulfide/thiourea, but not for selenium, as far as I
know. I'm not sure what reaction, if any, occurs between selenium
toner and silver halide. In any case, commercial selenium toners like
KRST contain fixer-like ingredients which will degrade your positive
silver halide image as you try to "tone" it.
If you use light-fogging followed by re-development, you can
selenium-tone your film after fixing to "deepen" the image tone. I've
read speculation that a toning step like this is part of the Scala
process.
Jordan
--
Jordan Wosnick
jwosnick@xxxxxxxxxxx
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