[LargeFormat] Jobo CPE and E6 s step process

[mark blackman]

Sounds like I need to keep 9 litres of water at 38C for around 30 minutes. I
may 'borrow' a couple of the large vacuum flasks used at work to dispense
coffee in a futile attempt to keep people awake during long, boring,
meetings. They come with a handy pump that dish out around 250 ml a push, an
ideal measure. Anyone else tried this?

Now all I've got to do is get the hang of loading those 4x5 reels without
getting two sheets in one slot, dropping a box of film on the floor or
forgetting the central column, and how the hell are you supposed to put the
two flaps on in the dark, have an assistant?*. Don't talk to me about the
film loader, I'm fed up of being discriminated against for being left
handed.

* Could be interesting though, nude film loading?


----- Original Message -----
From: "Pete Caluori" <pcaluori@hotmail.com>
To: <largeformat@f32.net>
Sent: Monday, September 02, 2002 7:00 PM
Subject: Re: [LargeFormat] Jobo CPE and E6 s step process


>
>
> From: "mark blackman" <mark.blackman1@btinternet.com>
> Date: Mon, 2 Sep 2002 06:31:16 +0100
>
> I've a quick question: Jobo recommend the final wash phase (before
> stabilising) involves 10 water changes. Does this water have to be at 38
> Centigrade? In fact, does the temperature matter at all?
>
> Greetngs Mark,
>
> I've processed quite a few sheets on the JOBO and would offer the
following
> considerations.  Personally I think the temperature does matter, but
that's
> a matter for interpretation.  I do not consider +/- 5 degrees F to be
> significant in the final wash.
>
> I believe your wash will be more complete at a higher temp. vs. a lower
> temp.  The emulsion will swell considerably under the 38C processing temp
> and if you shock it with "colder" water I would think that the emulsion
> could be damaged.  Note, I have not tried this, so I don't know what would
> happen.
>
> Frequently, I will give more/longer wash cycles than JOBO recommends based
> on observing residual bleach/fix still in the emulsion.  I use the
> stabilizer at a lower temperature (typically 24C) so during the wash I
will
> gradually lower the temperature by changing the water with progressively
> cooler water.  I never exceed more than a 5 degree F drop at a time.
>
> If you are using the Expert drum and change the temperature more that
10-15
> degrees F, the emulsion will shrink and curl inwards.  The film can then
> become lose from the ribs and make contact with the second sheet (this
only
> applies to 4x5 film in the 3010 drum.)
>
> So the quick answer to your question is no, but keep all factors in mind.
>
> Regards, Pete
>
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