[pure-silver] Re: "Green" Developer
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 28 Nov 2009 18:39:45 -0800
----- Original Message -----
From: "Elias Roustom" <elroustom@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Saturday, November 28, 2009 6:24 PM
Subject: [pure-silver] Re: "Green" Developer
Yes that really is a question.
I am complying with the laws of my state already - but I'm
trying to
be better than simply compliant.
"In sewered areas, developer and rinse solutions may be
poured down
the drain."
Full text here:
http://www.mass.gov/dep/recycle/hazardous/photo.htm
Thanks,
Elias
Unless you are developing a massive amount of film the
volume of developer is not going to contribute much to
polution. Some silver accumulates in B&W developer but most
of it winds up in the fixer. Color blix or separate bleach
and fix solutions also accumulate a significant amount of
silver, more than in B&W because no silver remains in the
film. For ordinary fixer one can recover much of the
dissolved silver by putting steel wool in the solution and
leaving it for a time. The steel wool should be free of oils
or soap. The silver will plate out on the wool.
An interesting experiment is to clean a penny until and
place it in some used fixer. After a time it will become
silver plated.
There are more elaborate and efficient methods of
recovering silver. Commercial color labs recover nearly all
the silver from solutions for three reasons: 1, it extends
the capacity of the solutions; 2, environmental protection
(probably required by law); 3, recycling the silver, which
is worth some dough and a large lab, like a motion picture
lab, will recover a lot if it.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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