[pure-silver] Re: Developing Plus-X in Rodinal 1+100
- From: "Elias Roustom" <elroustom@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 16 Dec 2008 15:55:32 -0500
Is the key "with constant agitation"? What is it with only
intermittent agitation?
On Tue, Dec 16, 2008 at 3:24 AM, Klaus Schreiber <luxikon@xxxxxx> wrote:
> 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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