From: Ryuji Suzuki (rs@silvergrain.org)
Date: 10/31/03-02:36:56 PM Z
From: Sandy King <sanking@clemson.edu>
Subject: Re: Test for Silver Metal in Print?
Date: Fri, 31 Oct 2003 15:16:10 -0500
> This prompts a further question. Since there clearly appears to be
> some silver metal remaining in a platinum or palladium toned
> kallitype, would it make sense from the perspective of permanence to
> follow the pt/pd toning with selenium toning to convert the the
> remaining silver in the print to silver selenide?
One question is people report that selenium toner reverses the gold
toning if silver-gelatin prints are double toned. So people usually
selenium tone first, and then gold. Sulfide is probably worse,
depending on which formula you use. But if your goal is to maximize
protection, I would suggest to try a polysulfide toner or (polysulfide
+ selenium) toner and see if it affects the image hue or quality in
any way. If kallitype grains are big, hue shift should be minimal,
especially most of the silver is covered by palladium. Also, if grains
are big, selenium toner should be also very effective, but if grain
size distribution is unknown, I think sulfide is more reliable.
Another option is AGFA Sistan or Fujifilm Ag Guard.
-- Ryuji Suzuki "Reality has always had too many heads." (Bob Dylan, Cold Irons Bound, 1997)
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