From: argus (ARGUS@erols.com)
Date: 05/10/01-07:49:11 AM Z
Birchwood Laboratories, Inc., Eden Prairie, Minn sells a Brass Black "To
blacked or antique brass, copper or bronze". For what that's worth.
----- Original Message -----
From: <alnovo@inwind.it>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, May 09, 2001 1:57 AM
Subject: Re: Chemistry advice
> Many years ago I made some images on brass, using a photoresist laquer as
sensitizing medium, and "developing" with a simple solution of sodium
sulphide. Don't ask me about concentration and times, it was made by visual
inspection.
> The colour is a deep, semi-matte black-brown (depending on the thickness
of the copper sulphide layer -brass is a copper-zinc alloy)
>
> Alberto
>
> Richard Knoppow wrote:
> > >Darryl Baird wrote:
> > >Jewelry supply outfits carry a variety of black patina chemistry. As I
> > >recall, liver of sulfur will darken, if not blacken brass. Use the
words
> > >"metal patina" on a WWW search.
> > >
> > >good luck
> > >
> > >-Darryl
> > >~~~~~~~~~~~~~jportale wrote:
> > >> {snip}
> > >> If one insists on going the chemical route, I would ask around an old
time
> > >> hardware store or a shop that sells patina chemicals for metals. They
may
> > >> have something..
> > >
> > I wonder of Kodak Brown Toner would work. Its essentially Liver of
Sulfur
> > and and sodium carbonate.
> > ----
> > Richard Knoppow
> > Los Angeles,Ca.
> > dickburk@ix.netcom.com
> >
>
>
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