[pure-silver] Re: Sistan Saga
- From: Christopher Woodhouse <chris.woodhouse@xxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 21 Jun 2005 16:56:47 +0100
Quoting from a general Agfa chemical pdf file
Mixing instructions
For use 25 ml SISTAN is diluted with 975 ml water. The
correctly processed and washed prints are agitated for one
minute in SISTAN solution after the final wash.
NB Too high a SISTAN concentration can lead to stains which
take some time to appear – particularly if prints are in close
contact (stored stacked). Care should then be taken that the
fronts and backs of prints are wiped before drying to avoid
partial over-concentration caused by dried drops of SISTAN.
Pinch and transport rollers on mechanical processors and
continuous dryers should be carefully wiped clean to stop the
SISTAN solution crystallising on them.
Yield
Up to 2 m² black and white paper per litre ready solution
(equivalent to approx. 45 sheets 17.8 x 24 cm). The solution
can be used down to the last drop.
Storage life
The concentrate will keep virtually indefinitely in closed bottles.
Ready solution should be kept in capped glass bottles, not left
in open trays.
On 21/6/05 2:35 pm, "Adrienne Moumin" <photowonder2010@xxxxxxxxxxx> wrote:
> Squeegee the prints, what a concept! I guess I've been so spooked by the
> hazard warnings that I've tried to have the stuff touch as little as
> possible of whatever I use for printing....
>
> I've tried repeatedly to download the PDF from the Agfa site, but my puter
> freezes up each time, & my e-mails to them go unanswered. The toll-free
> operator says there's no listing for them, and the site only gives a UK
> phone number. Hence my reliance on the expertise of those on this list, to
> whom I am (as always!) hugely grateful.
>
> -Adrienne Moumin
>
> ***************************************
> And please remember: ART HAS NO RULES.
>
>
>
>> ------------------------------
>>
>> From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
>> Subject: [pure-silver] Re: Sistan Saga
>> Date: Mon, 20 Jun 2005 19:01:15 -0700
>>
>>
>> ----- Original Message -----
>> From: "Adrienne Moumin" <photowonder2010@xxxxxxxxxxx>
>> To: <pure-silver@xxxxxxxxxxxxx>
>> Sent: Monday, June 20, 2005 6:02 PM
>> Subject: [pure-silver] Sistan Saga
>>
>>
>>> I just learned an interesting, if puzzling, lesson about
>>> drying prints face down on racks. Or at least I'm assuming
>>> that's the solution when using Sistan?
>>>
>>> When I began to remove the the (face up) prints, each had
>>> a small pool of orange liquid in one of the print
>>> "depressions" (a low spot) which hadn't yet dried from 24
>>> hours ago! One print which apparently had a dried one of
>>> these in the white border had a circular orange stain.
>>> And one with a large shadow area has some sort of dulling
>>> on part of it. The few matte finish prints were fine.
>>> (Of course the majority of this batch were on glossy
>>> paper...)
>>>
>>> An interesting observation: most prints dry bowl-like,
>>> with the edges curled. The Sistan-treated prints dried in
>>> ramdom high & low spots, revealing (I guess) the uneven
>>> dry time.
>>>
>>> I suppose I will try to rescue the prints by washing, and
>>> experiment on a few by re-treating & drying face-down.
>>>
>>> Stay tuned for the next exciting chapter of the darkroom
>>> follies!
>>>
>>> -Adrienne Moumin
>>>
>> Sistan treated prints and films _must_ be squeegeed. I
>> usually lay the prints on the bottom of a flat tray, a sheet
>> of glass or plastic or any smooth clean surface will do. I
>> find rubber squeegees leave marks so I just sponge them off.
>> This also helps the prints dry faster.
>> Generally, prints curl toward the emulsion side because
>> the emulsion shrinks up after processing. Unprotected paper
>> base (fiber base) also shrinks after being soaked and dryed
>> but the relative amount of shrinkage is less than the
>> emulsion so there is a net curl. Drying on screens with the
>> emulsion facing the screen tends to slow down the drying of
>> the emulsion so that the difference in shrinkage is less.
>> Fiber prints should be dried slowly to minimize curls and to
>> avoid edge frilling. The prints will not be smoothly flat
>> after drying. I also use a dry mounting press to flatten
>> prints. This seems to work very well and the flattening
>> seems to be permanent.
>> Agfa warns about staining from an overdose of Sistan in
>> its instructions. Instructions are included in the
>> all-purpose PDF datasheet on Agfa chemicals on their web
>> site. Note also that the instructions for diluting have
>> changed over the years. I have a stash of Sistan so can
>> compare labels with each other and with the current
>> recommendations.
>>
>> ---
>> Richard Knoppow
>> Los Angeles, CA, USA
>> dickburk@xxxxxxxxxxxxx
>>
>>
>> ------------------------------
>>
>
>
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--
Regards Chris Woodhouse
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