Re: [APML] TP Pre Rinse

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

Well for what it's worth I ran my test tonight.  I knew better but I
actually tested two things at the same time, not good for scientific
accuracy.  The two test parameters were the five minute water pre-rinse and
a new Jobo 3010 expert rotary developing tank.

The test was to use the new tank and do all of the other steps as I normally
do and add the pre-rinse.  I used one sheet of hypered and one sheet of
un-hypered 4x5 TP.

Results were a disaster for the hypered sheet.  It was totally ruined with
dark areas that look like the emulsion ran.  Maybe the water did this as it
was introduced to the tank?  The direction of the flow is follows the
upright tank position, not the horizontal rotary position.  Totally weird.
The un-hypered sheet was perfect.

If it were not for the fact I used a new un-proven tank I would say that
pre-soaking is still not the thing to do.  As Kent said below hypered film
hates water.

At some point I will re-run the test but for now I need my hypered sheets
for this weekend.

Keep your TP dry mates.........

Jim


> Jim:
> The problem with doing a pre-soak with hypered Tech Pan goes back to the
fact
> that hypered TP and moisture/water don't mix; ie. moisture causes increase
in
> base fog level and possible unevenness. This can happen during
> transportation, storage, in the camera or in a pre-soak. That's why we use
N2
> purges, etc.
>
> I tried pre-soaking hypered TP 120 a few years back and the results were
> terrible.
>
> Kent Kirkley
>
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