[pure-silver] Re: Kodak reference for using selenium toner as an alternative to ST-1 test solution
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 17 Oct 2009 00:11:07 -0700
----- Original Message -----
From: "Tom Kershaw" <tom@xxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, October 16, 2009 10:16 AM
Subject: [pure-silver] Kodak reference for using selenium
toner as an alternative to ST-1 test solution
Going through the pure-silver archives, I came across a
reference from 2007 by Richard Knoppow suggesting that at
one time Kodak recommended using KRST diluted 1:9 as an
alternative to the ST-1 solution (testing for residual
silver) but no longer do. Is there a reference for this
information?
Tom Kershaw
Its in some editions of the _Kodak Black and White
Darkroom Dataguide_ and probably elswere. I don't have the
citation at hand.
Kodak eventually dropped this recommendation since the
test will fail where there is a large amount of hypo in the
emulsion where the sulfide test does not. For prints or
negatives that are well washed the test works well.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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