[APML] TP Pre Rinse

["Jim Janusz" <jjanusz@dc.rr.com>]

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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