[pure-silver] Re: a recent problem with fine dust on negs
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 24 Jul 2009 12:57:09 -0700
----- Original Message -----
From: "Janet Cull" <jcull@xxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, July 23, 2009 4:35 PM
Subject: [pure-silver] Re: a recent problem with fine dust
on negs
I'm glad this is fixed but have a look at the negatives
which caused you trouble with a strong magnifier. If the
problem was dust or embedded particles (which I suspect) you
should see it on the negative. Light spots on the print
mean, of course, dark spots on the negative. These are more
likely to result from embedded particles than from
undissolved particals during developement. Spots of unfixed
halide will similarly be visible and might be removeable by
re-fixing in fresh fixer (if the halide has not darkened
forming photolytic silver) I think this is very unlikely.
Particles deposited on the film during processing but later
removed may also leave scars on the surface of either side
of the film. These may be made visible by shining a light
across the surface and examining it with a magnifier.
If there are no particles or dust on the negatives its
possible the spots may have been caused by something getting
on the film in the camera.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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