[pure-silver] Re: Pre-soaking film
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 29 Apr 2010 15:25:08 -0700
----- Original Message -----
From: "Tim Daneliuk" <tundra@xxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, April 29, 2010 3:09 PM
Subject: [pure-silver] Re: Pre-soaking film
On 4/29/2010 5:05 PM, harry kalish wrote:
Quite awhile ago, Ilford stopped recommending a pre-soak
because they
started building a wetting agent into their film. But it
gave me
confidence to continue the pre-soak, with the ritualistic
tapping of the
daylight film tanks on a firm surface to dislodge air
bubbles from the
surface of the film.
Harry
With this sort of thing, it's probably better to be
consistent than to
constantly look for the "right" way. I started presoaking
years ago
because I believed (rightly or wrongly) it would improve
consistency,
particularly with short dev times - say with a fast acting
developer
like D-76 straight and N-3 processing. At this point, all
my
calibration is built around it and I don't much feel like
changing
my ways and recalibrating everything because of new
fashion.
Jobo recommended pre-soaking for their rotary
processors, it's necessary with them to insure uniform
development. Kodak also recommends pre-soaking where several
sheets of film are to be developed in a tray, it prevents
sticking and, again, insures uniformity. However, it
probably makes little difference in other kinds of
processing. I doubt if it does any harm but the induction
time _is_ affected and must be taken into account when
determining the final development time. There may be some
wetting agents in some films which will be washed out in a
pre-soak. I've never seen any confirmation of this in any
literature.
It is good practice to apply rapid agitation at first.
I don't consider D-76 rapid acting. Compare its times
to some older developers like DK-50 or D-61, the later a
once standard photofinishing developer.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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