[pure-silver] Re: Fishy developer: NOW Triethanolamine
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: "'pure-silver@xxxxxxxxxxxxx'" <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 17 Dec 2004 11:23:39 -0500
I too was surprised at the amount of DEA in the commercial product. The TEA I
get from The Chemistry Store is 99% and has no smell.
One manufacturer had the following table which may be useful.
Wt% pH* Wt% pH*
--------------------------------
0.01 8.8 1 9.8
0.02 8.9 2 9.95
0.04 9.1 4 10.1
0.1 9.25 10 10.3
0.2 9.45 20 10.5
0.4 9.6 40 10.6
--------------------------------
*Commercial product will be ~0.25 pH units higher for each entry.
Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of Ryuji Suzuki
Sent: Friday, December 17, 2004 11:10 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Fishy developer
From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
Subject: [pure-silver] Re: Fishy developer
Date: Fri, 17 Dec 2004 10:07:44 -0500
> The MSDS for DTPA that I looked at said that it had a slight ammonia
> odor. Pure DTPA probably is odorless, the stated smell may be from
> some impurity. Commercial grade triethanolamine contains ~10%
> diethanolamine which definitely has an odor.
Well MSDS describes their particular product alone. To the point, the
concentration of DTPA in aquaous solution like developer solution, it's odorless
and can't be the part of fishy smell described.
I don't know about commercial grade triethanolamine. I routinely get TEA of 99%
or higher. Diethanolamine does smell so if 10% of some "TEA" is actually DEA, it
would smell. Why such a large part of DEA is left in? Either way, in an actual
composition of a solution, Raoult's Law is also to be remembered.
--
Ryuji Suzuki
"Keep a good head and always carry a light camera."
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