[pure-silver] Re: Pre-soaking film
- From: harry kalish <hksvk@xxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 29 Apr 2010 21:58:43 -0400
I have had good even development using a two minute presoak, both for roll
and sheet film, agitating constantly in three different ways to eliminate
circulation patterns. But I don¹t think I have ever developed film for less
than six minutes.
Harry
On 4/29/10 6:38 PM, "Ralph W. Lambrecht" <info@xxxxxxxxxxxxxxxx> wrote:
> I've only noticed pre-soaking doing some damage when done for an insufficient
> length of time. If the emulsion is not thoroughly pre-soaked, subsequent
> development may not be even. I noticed this with pre-soak times of less than
> 1-3 minutes, and hence, I recommend a minimum pre-soak time of 5 minutes to be
> on the save side.
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> Regards
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> Ralph W. Lambrecht
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> http://www.darkroomagic.com
> http://www.waybeyondmonochrome.com
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> On Apr 30, 2010, at 00:25, Richard Knoppow wrote:
>
>>
>> ----- Original Message ----- From: "Tim Daneliuk" <tundra@xxxxxxxxxxxxxx>
>> To: <pure-silver@xxxxxxxxxxxxx>
>> Sent: Thursday, April 29, 2010 3:09 PM
>> Subject: [pure-silver] Re: Pre-soaking film
>>
>>
>>> On 4/29/2010 5:05 PM, harry kalish wrote:
>>>> Quite awhile ago, Ilford stopped recommending a pre-soak because they
>>>> started building a wetting agent into their film. But it gave me
>>>> confidence to continue the pre-soak, with the ritualistic tapping of the
>>>> daylight film tanks on a firm surface to dislodge air bubbles from the
>>>> surface of the film.
>>>>
>>>> Harry
>>>
>>> With this sort of thing, it's probably better to be consistent than to
>>> constantly look for the "right" way. I started presoaking years ago
>>> because I believed (rightly or wrongly) it would improve consistency,
>>> particularly with short dev times - say with a fast acting developer
>>> like D-76 straight and N-3 processing. At this point, all my
>>> calibration is built around it and I don't much feel like changing
>>> my ways and recalibrating everything because of new fashion.
>>
>> Jobo recommended pre-soaking for their rotary processors, it's necessary
>> with them to insure uniform development. Kodak also recommends pre-soaking
>> where several sheets of film are to be developed in a tray, it prevents
>> sticking and, again, insures uniformity. However, it probably makes little
>> difference in other kinds of processing. I doubt if it does any harm but the
>> induction time _is_ affected and must be taken into account when determining
>> the final development time. There may be some wetting agents in some films
>> which will be washed out in a pre-soak. I've never seen any confirmation of
>> this in any literature.
>> It is good practice to apply rapid agitation at first.
>> I don't consider D-76 rapid acting. Compare its times to some older
>> developers like DK-50 or D-61, the later a once standard photofinishing
>> developer.
>>
>> --
>> Richard Knoppow
>> Los Angeles, CA, USA
>> dickburk@xxxxxxxxxxxxx
>>
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