[pure-silver] Re: Using a selenium toner solution to test for residual silver
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 19 Jul 2010 07:34:04 -0700
----- Original Message -----
From: "Tom Kershaw" <tom@xxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, July 19, 2010 3:56 AM
Subject: [pure-silver] Re: Using a selenium toner solution
to test for residual silver
On KHCA and other wash aids, do you have any suggestions
as to a starting point for soak times assuming continuous
agitation (presumably optimal as with most photographic
solutions)? - I've been using 3 minutes in the last week
for 8x10" fibre base work prints.
On Gold toning: Tim Rudman (the lith printer) has
suggested prints should be fixed after Gold toning, what
is your view?
Tom
The research paper Kodak published on KHCA has a curve
which shows that maximum effect is gotten in about three
minutes. Longer treatment probably does no harm but the
effect is exponential so once the maximum effect is
approached longer treatment doesn't do much. Kodak
recommends three minutes for double weight paper and two
minutes for film and single weight paper.
I suspect the "gold" toner Tim is talking about is
Nelson's Gold. This does require fixing after toning because
it leaves some halide in the emulsion. I don't think any of
the standard gold protetective toners require re-fixing,
only washing.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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