[pure-silver] Re: What Causes Selenium Toner Staining
- From: Tim Daneliuk <tundra@xxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 7 Mar 2016 08:35:26 -0600
On 03/06/2016 08:03 PM, `Richard Knoppow wrote:
Can you describe the stain in more detail. The selenium staining I've seen
was due to decomposition by acid after incomplete washing and was peach
colored. This is the effect that requires treating prints fixed in an acid
fixer with some sort of alkali bath before toning.
If you have not been getting stains before then _something_ must have
changed. I don't have a definite clue but going over your whole routine may
turn something up. Anything new there, newly mixed something or new paper
even if its stuff you have been using?
The stain is a light rose/purple/brown color. It's visible only on the
unexposed portions
of the print, like the borders. Suspiciously, it seems more evident on the edge
that is at the top of the print washer ... more on that below.
My protocol is:
- Dektol for 2 mins
- Acetic acid-based stop for 20-30 sec
- Fix with Hypam using Ilford's recommended 1 min fast fix
- Wash for 5 mins
- Into mix of Kodak Rapid Selenium Toner 1:35 + PermwWash 5-8 mins
- Wash for 5 mins in Oriental archival washers and then hold
When all the prints are done, was the whole lot for 1 hour in the archival
washer.
Things that have changed:
- I switched to Arista.EDU Ultra VC FB several years ago. This paper seems
to tone much more readily than others I have used.
- I note that this paper will not sit inside the print washer, but floats
to the top. So I use a couple of clothespins clamped to a divider and
a slide the print under the tips so that the print remains fully submerged.
P.S. I don't recall if Hypan is an acidic or alkaline fix.
On 3/6/2016 4:46 PM, Tim Daneliuk wrote:
For some time now, I've noticed that the unexposed areas of a print
show evidence of a what appears to be selenium staining - say on the
borders of the print. I've changed nothing in my chemical formulation
or wash discipline.
Any ideas on what the culprit is here?
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
WB6KBL
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Tim Daneliuk tundra@xxxxxxxxxxxxxx
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