[pure-silver] Re: 'Ripening' procedure for developer?
- From: "EJ Neilsen" <ej@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 3 May 2007 20:34:07 -0500
If you mix your chemicals from a formula, they need to be mixed in that
order. You most certainly have reactions happening between the available
ions in solution and the film, but the available ions will and can change as
the solution cools, changes pH, etc. If you by your packaged chemicals,
some do have more than one package and they need to be mixed separately as
the directions require. When you mix dry chemicals into a water solvent, you
don't just magically end up with some "active" molecule but rather a bunch
of ions running around looking for the "best" fit. The attractions can be
momentary or more long lasting. These are based on electric potential. It
just takes time for some of these events to equalize. This is not a proposed
phenomenon, but the way things work.
Some reactions will only take place at specific pH levels. When ever I mix
my 130 developer, I always let it sit for a day before first use unless I am
really pressed to get a job out. Thank goodness those days are over. D76
will continue to change over time, going up and down in activity.
Ripening or seasoned developers that I have encountered were mostly in large
tank processing like an E6 roller transport line or a 50" ciba machine,
where the by products from the film or paper become a part of the solution
and then become an influence on how those other reactions proceed.
Eric
Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
Skype ejprinter
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> bounce@xxxxxxxxxxxxx] On Behalf Of hksvk
> Sent: Thursday, May 03, 2007 8:10 PM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: 'Ripening' procedure for developer?
>
>
> What about standard B/W developers like D-23 2-bath for film and old paper
> developer formulae from Agfa and GAF for instance? I thought that the
> chemical reactions occur between the developers and emulsions, with the
> substances in the developer steering reactions one way or the other. But
> is
> there some other way that the solutions change (other than the reaction
> with
> dissolved oxygen) over a period of 12 hours or so after preparation? Can
> someone offer more than anecdotal accounts of this proposed phenomenon?
> Thanks.
>
> on 5/3/07 5:27 PM, EJ Neilsen at ej@xxxxxxxxxxxxxxxxxxxxxxxxxx wrote:
>
> > Many solutions do not get to equilibrium for several hours if not days.
> Some
> > will ripen as they get some use like E6 1st developer. The interaction
> > between the molecules doesn't stop just because the powder appears to
> have
> > been suspended in the liquid. Buffering agents and other "active" links
> are
> > lurking under the radar of the human eye.
> >
> > There are some solutions which can be used right after mixing without
> any
> > bad effects. Just remember to do it the same all the time. Do you use up
> the
> > solution right after mixing? Or does it sit for days and weeks? More
> than
> > likely for days and months, so relax and have a drink and come back
> tomorrow
> > and start the journey through the trays and tanks.
> >
> > Eric
> >
> > Eric Neilsen Photography
> > 4101 Commerce Street, Suite 9
> > Dallas, TX 75226
> > 214-827-8301
> > http://ericneilsenphotography.com
> >
> > Skype : ejprinter
> >> -----Original Message-----
> >> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> >> bounce@xxxxxxxxxxxxx] On Behalf Of Jeffery Smith
> >> Sent: Thursday, May 03, 2007 4:06 PM
> >> To: pure-silver@xxxxxxxxxxxxx
> >> Subject: [pure-silver] Re: 'Ripening' procedure for developer?
> >>
> >> That only holds for a few developers as far as I know. I have
> >> read
> >> that pyro may work better after standing a bit, but my
> >> prescysol
> >> seems to die quickly so I use it as quickly as possible.
> >>
> >>
> >> At 03:59 PM 5/3/2007, you wrote:
> >>> I have heard it be said that, for optimum and consistent
> >> performance,
> >>> developers should 'ripen' or 'cure' 12-18 hours after
> >> preparation. It seems
> >>> this entails just being contained in the flask coming to room
> >> temp and
> >>> beyond. Is there a photo-chemist out there who could comment
> >> on this
> >>> procedure?
> >>> Thanks,
> >>> Harry.
> >>>
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> >
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