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cause of discolored KRST
I usually reuse working solutions of Kodak Rapid Selenium Toner. Last
night, I toned a print in 1:9 dilution and after finished, put the working solution back into a clear glass bottle. This morning, the bottle and liquid was completely discolored. The bottle was caked with something dark green/purple. My fear is that I accidently mixed KRST and Fixer. Any ideas? |
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cause of discolored KRST
On Sun, 29 Jan 2006 17:00:03 GMT, Mike wrote:
This morning, the bottle and liquid was completely discolored. The bottle was caked with something dark green/purple. My fear is that I accidently mixed KRST and Fixer. Any ideas? That could be an issue if the fixer was used. Un-used fixer doesn't react with KRST immediately and in fact IIRC it's used as the carrier for the selenium. Check the bottle. But note that KRST will react with fixer if it has been used and therefore has silver in it. == John - Photographer & Webmaster www.puresilver.org - www.xs750.net3 |
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cause of discolored KRST
On Sun, 29 Jan 2006 11:36:39 -0600, John
wrote: On Sun, 29 Jan 2006 17:00:03 GMT, Mike wrote: This morning, the bottle and liquid was completely discolored. The bottle was caked with something dark green/purple. My fear is that I accidently mixed KRST and Fixer. Any ideas? That could be an issue if the fixer was used. Un-used fixer doesn't react with KRST immediately and in fact IIRC it's used as the carrier for the selenium. Check the bottle. But note that KRST will react with fixer if it has been used and therefore has silver in it. == John - Photographer & Webmaster www.puresilver.org - www.xs750.net3 January 30, 2006, from Lloyd Erlick, I've wrestled with this problem for some time. I use my KRST diluted only 1+5, so it's quite costly. I also tend to mix up three liters at a time -- (well, I don't actually mix it up any more, I simply continuously top up my stock, but that's another story...) -- so that makes it even more expensive. Some time ago I went on an anti-smell rampage in my darkroom practice. I just had had enough of any smell I didn't like, and I looked for ways to eliminate them. I found the number one culprit in the darkroom is acid. Acid stop bath, acid in fixer, the lot. I removed all forms of acid from my darkroom and found the place was far more pleasant. I also found my materials behaved better. For complete details about smell abatement in the darkroom, see my article under the 'technical' button in the table of contents of my website, heylloyd.com. Regarding selenium toner (KRST), I found that the dark murkiness it inevitably developed over time and use failed to appear once there was no acid in my chemistry. The faint traces of the dark precipitate that did appear were easy to remove by regular filtering through coffee filters. My KRST performed perfectly well for years while remaining close to water-clear. It depletes through solution carry-out on the sheets of FB paper I tone. Carry-out depletes the solution far more quickly than chemical exhaustion because of toning action. I continuously to up my solution with fresh KRST as needed to retain the solution level I desire. I've never heard any report of how to keep selenium toner from becoming dark and murky. I can't explain how the absence of acid contributes, or perhaps more properly, how acid causes the dark murk. But I do know it works. (Please note that changing stop bath to citric acid is fine for smell abatement, but it still murks up the selenium toner. If an acid stop is used but the fixer is non-acid, it is still not possible to adequately wash the acid from the FB material; the KRST will still murk up, although it will take longer. Water-stop and non-acid fixer contribute to clear KRST long-term.) Also, I think it's necessary to make KRST with distilled water. My web site also has an article about my use of KRST. regards, --le ________________________________ Lloyd Erlick Portraits, Toronto. voice: 416-686-0326 email: net: www.heylloyd.com ________________________________ -- |
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