[pure-silver] Re: Was: Blue Water
- From: Sauerwald Mark <mark_sauerwald@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 20 Sep 2006 18:24:09 -0700 (PDT)
In the case of Pyro they tell you to mix right before
using it because the developer oxidises and looses
effectiveness very quickly after it is mixed.
That is one of the reasons why it is difficult to get
good results with pyro in a Jobo - all that agitation
makes the developer suck up the oxygen and go bad.
--- Jeffrey Thorns <puresilver@xxxxxxxxx> wrote:
> > BTW, while pre-soaks are often recommended there
> is no real reason
> >to use them except where there may be a wetting
> problem with the
> >developer. This is the case when Jobo machines are
> used and Jobo
> >recommends the soak. They are also recommended by
> Kdoak for tray
> >development of multiple sheets because a soak will
> eliminate the
> >tendency of sheets of film to stick to each other
> in the tray.
> > Soaking will affect the induction time and
> hence of total
> >development time so must be taken into account. The
> longer the
> >overall development time the less its effect.
> Induction time is the
> >time between application of the development and the
> time the image
> >first begins to appear.
> >
>
> I notice that the instructions with the Formulary's
> WD2D+ explicitly
> tell you to do a pre-soak with water that has a
> small amount of
> Photo-Flo -type chemistry in it. (They also tell you
> to mix the pyro
> *immediately* before using it.)
>
> Could the reason be to 'soften the blow' of an
> active developer as it
> hits the film?
>
>
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