[pure-silver] Re: WashAid Question
- From: Tim Daneliuk <tundra@xxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 03 Dec 2008 18:46:53 -0600
Richard Knoppow wrote:
>
> ----- Original Message ----- From: "Tim Daneliuk" <tundra@xxxxxxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Wednesday, December 03, 2008 2:31 PM
> Subject: [pure-silver] Re: WashAid Question
>
>
>> Eugene Barrington wrote:
>>> Thanks for that info. I'm using the Kodak product which is anhydrous (I
>>> think). Obviously not much is required for my modest needs! I'll break
>>> out the FB paper and produce some real prints - but RC is so handy and
>>> washes so quickly! Toning and hypo clearing in the one bath is another
>>> time and water saver.
>>> Eugene B.
>>
>> I should have made clear that the dilution of toner selected is
>> to guarantee a *minimum* of 5 mins in the toner/PermaWash soup.
>> My typical toning times are more like 6-8 min, with the
>> toner (Kodak Rapid Selenium) diluted in the 1:25 to 1:30 range,
>> depending on the paper in question.
>>
>>
> You should be aware that it was found some years ago that toning in
> highly diluted KRST (1:19) as was once recommended for microfilm does
> not provide complete image protection. The current recommendation (IPI
> and Kodak) is to use a polysulfide toner like Kodak T-8 or Kodak Brown
> Toner. The discontinued AGFA Viradon was also of this type. Selenium
> toner is selective, toning dense areas first, so that light toning will
> leave low density areas vulnerable to oxidation. Polysulfide toners tone
> uniformly so that partial toning provides some protection to all
> densities. Unfortunately, the amount of toning using either KBT or
> selenium when toning is selenium is extended sufficiently to provide
> protection of the low density areas will produce some change in image
> color or density or both. Dr. Douglas Nishimura recommends that KRST be
> used at a a dilution of no more than 1:9 and for not less than 3 minutes
> to provide complete image protection.
> Where it is imparitive for some reason that the appearance of the
> image remain unchanged an image stablizer such as AGFA Sistan or Fuji Ag
> Guard can be used but neither is as effective as proper toning. AGFA
> Sisan may still be available. Ag Guard does not seem to have been sold
> outside of Japan.
>
I've never really regarded KRST as an archival agent - I use it to get
a slight cooling effect in the final look of cold tone prints. I wash
both before- (about 5-10 mins) and after (1 hr in an archival washer)
the toning/PermaWash bath. Long ago I did some hypo stain tests
that seemed to confirm this method was removing the residual hypo
effectively. This may be because I use Ilford rapid fix (Hypam) at full
strength and fix for only 1 minute.
--
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Tim Daneliuk tundra@xxxxxxxxxxxxxx
PGP Key: http://www.tundraware.com/PGP/
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