Re: [APML] TP Pre Rinse

["Andrew Schott" <aschott@cfl.rr.com>]

I grew up presoaking my film.  Starting waaaaay back in the days of high
school photo lab and using Panatomic-X.  We were told the anti-halation
backing needed to be dissolved before developing and in some cases, a bluish
tinge could be seen as the rinse was poured off.

As a habit, I load my film (mostly 35mm nowadays) into the tanks while
everything is dry, hands, tanks, darkroom, etc..  After handling the film is
completed, I then fill the tanks with tapwater (chlorine and all:-) and let
them soak while I set up the developer, stop and fix in large plastic cups.
Once everything is ready to go, I dump the rinse and start processing.  Air
bels, reticulation,  and blotchyness have never been a problem.


----- Original Message -----
From: "Jim Janusz" <jjanusz@dc.rr.com>
To: <astro-photo@seds.org>
Sent: Monday, April 08, 2002 5:09 PM
Subject: [APML] TP Pre Rinse


> As one of the individuals that have had bad experiences with pre-rinsing
TP
> I was surprised to find this on the Jobo web site.
>
> A five minute pre-rinse of any black and white film works with the
developer
> to produce a negative with manageable contrast and good tonal range, using
> the manufacturer's recommended 'hand process' (intermittent agitation)
> times. To pre-rinse, put a quantity of process temperature water in the
> tank, equal to, or slightly greater than, the amount of developer. Allow
> this loaded tank to rotate on the processor for five minutes. At the end
of
> that period, pour out the pre-rinse water, and pour in the developer.
> Pre-Rinse times shorter than five minutes may produce irregular
development,
> and should be avoided.
>
> When I tried pre-rinsing TP I never went anywhere near 5 minutes.  I'm
going
> to test a sheet of hypered 4x5 TP with a 5 minute pre-rinse and will let
you
> know the results.
>
> Jim
>
> Astronomy  Web Page at:
> http://www.astroimager.net/
>
>
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