[pure-silver] Re: Developing Plus-X in Rodinal 1+100
- From: titrisol <titrisol@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 16 Dec 2008 04:22:26 -0800 (PST)
Constant agitation maybe the key here. That exhausts the developer faster
--- On Tue, 12/16/08, Klaus Schreiber <luxikon@xxxxxx> wrote:
From: Klaus Schreiber <luxikon@xxxxxx>
Subject: [pure-silver] Re: Developing Plus-X in Rodinal 1+100
To: pure-silver@xxxxxxxxxxxxx
Date: Tuesday, December 16, 2008, 9:24 AM
Hi Elias,
it is not all true that's printed in development charts.
The German chemist Franz S. Borgerding published his experiment which consisted
in measuring the potential of Rodinal 1+50 at 20°C with constant agitation. It
fell under 700 mV after 17 minutes vs. normal hydrogene. That means that the
developer does not work no longer.
I quote: Beim Kippen jeweils nach etwa 17min (the developer as dead). Das
hübsche bei Entwicklern ist ja, daß sie Redox-Chemie machen und sich so per
Potentialmessung leicht in die Karten schauen lassen. Sinkt das Potential unter
ca. 700mV ggü. Normalwasserstoff ab, ist die Brühe photographisch mausetot und
selbst das Prinzip guter Hoffnung hilft nicht mehr.
luxikon
Elias Roustom schrieb:
>> Rodinal at 20°C is totally dead after 17 minutes of development. At
18°C
>> after about 22 minutes.
>>
>
> How can that be? Maco has Agfa APX in Rodinal 1+50 for 20 minutes. I
> would think they'd know...
>
> I don't know if this link will work for you because it leads to a PDF:
> http://www.maco-photo.de/files/images/TA_Agfa_Rodinal_multil.pdf
>
> This chart gives Plus X in 1+50 @ 20ºC for 13 minutes.
> Agitate first 30 sec, then one inversion every 30 seconds.
>
> I got great results following this chart with Rollei Retro 400 (120)
> in 1+50 @ 20ºC for 11.5 minutes.
>
> E.
>
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