----- Original Message -----
From: "Ryuji Suzuki" <rs@xxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Wednesday, April 05, 2006 1:44 PM
Subject: [pure-silver] Re: HCA (was dichroic fog)
On Wed, 5 Apr 2006 09:09:11 -0400, "Koch, Gerald" <gkoch02@xxxxxxxxxx>That's useful information. I was under the impression from the paper that the sequestering agents were for re-use. I can see where the effect of calcium in the water would be a problem even for one-shot use so I think I mis-interpreted it.
said:Five grams each of EDTA and citric acid represent the maximum percentage
as listed in the MSDS. As Richard suggested 2 grams each is probably a
more realistic amount and would save money. Actually when I use a
clearing agent I make it extemporaneously using spoon measure and
discard it after the session. The EDTA and citric acid are not needed
then and the darkroom is not cluttered with jugs and tanks.
Necessity of EDTA and citrate comes from the kind of water and fixer
used, as Richard cited Henn et al, and it is independent of whether you
use it one shot or not.
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