You're right that the PermaWash (like HCA right?) isn't achieving much
prior to KRST. I don't regularly use selenium, but I've read that acid
in the print is likely to cause staining, so some people use a
non-acidic fixer instead of standard fixer, or a mildly alkaline bath
prior to toning. This is to ensure no acid in the paper: longer water
wash at that stage is able to be avoided. Then hypo clearing after toning.
Actually, the active ingredient in KRST is made from thiosulphate with a
sulphur atom replaced by a selenium one. Selenium is chemically similar
to sulphur in the periodic table. I could find some history if you're
interested.
No doubt others with more practical experience will chime in.
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On 17/04/2023 4:47 am, Tim Daneliuk (tundra) wrote:
My normal archival fixing disciplines is:
1. One minute fix in Ilford rapid fixer
2. Five minute running water wash
3. Five minute PermaWash treatment
4. 3-7 min in Kodak Rapid Selenium Toner 1:40
5. 60min running water wash in an Eco Washer
Years ago, I tried combining the PermaWash and Toner
steps by diluting the KRST further to get a minimum
of 5 minutes time. This cause intermittent staining.
But as I read the ingredients for these concoctions,
I realized that KRST has Sodium Thiosulphate in it.
So ... should I really be toning first then hypo
clearning?
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