[pure-silver] Re: 'Ripening' procedure for developer?
- From: "Jeffery Smith" <jls@xxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 3 May 2007 20:29:22 -0500
Developers like D76 change for the worse over time. One of the problems is
pH change, which affects the activity of the developing agent. I have been
using divided D76, which is a bit more stable. The first bath allows
inactive developer to soak into the emulsion. Time and temp aren't
important. Transferred to the alkaline bath (borax), the developer in the
gelatin becomes active until it is exhausted. The first bath can be reused
over and over. The 2nd bath (cheap) is discarded.
But I am getting to the point that I don't trust developer unless it is
fresh. I have bought about 5 kits of Paterson citric acid developer. By the
time it reaches the states and gets into my darkroom, it is DOA.
Jeffery Smith
New Orleans, LA
http://www.400tx.com
http://400tx.blogspot.com/
-----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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