[pure-silver] Re: Sodium bisulfite
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 11 Mar 2005 13:44:48 -0500
I forget what Kodak recommends as far as useful life of the working
solution, something like 2 to 4 weeks. I find it easier not to overwork
the bath or try to extend its recommended life. This stuff's cheap to
make (or even buy for that matter) and I usually discard it after a
single long session or at most keep it a few of days. During warm
weather it will form a bacterial slime if kept too long.
Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx
[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Ryuji Suzuki
Sent: Friday, March 11, 2005 12:39 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Sodium bisulfite
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
Subject: [pure-silver] Re: Sodium bisulfite
Date: Fri, 11 Mar 2005 09:05:37 -0500
> No practical way of determining when to discard the bath except by
There is a very simple test for sulfite content of a solution. It's
called Ripper iodine titration method. Doesn't work with developers
unless developing agents are first separated but since the wash aid is
plain sulfite/bisulfite bath this is sufficient.
More practical way is to use silver nitrate test to evaluate whether
prints are washing fast enough every time prints are made. This is my
preferred method.
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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