From: Eric Neilsen (e.neilsen@worldnet.att.net)
Date: 02/05/02-10:19:16 AM Z
Don, Jeffrey answered many of your questions concerning FO. The bottom
line is does it make good prints. While Jeffrey seems to be calling OA an
impurity, I find it a good or valid component of a good batch, but as Carl
and Jeffrey point out to much is not good. Your coating solutions needs to
be adjusted for your papers. Sometimes this will require an alteration in
the formula, sometimes just a little more or less volume.
I have a how to section on my att web site for Ferric Oxalate. This is for
a direct to liquid approach. I has been discussed that this method my have
impurities in it. Perhaps, but if you make it carefully and repeat how you
make it, the variations from batch to batch are not a problem. As for how
difficult? expensive? The first time you make it is certainly a new
experience and getting small quantities of supplies may be more costly, but
slightly increasing the supplies pays off in the long run.
Eric Neilsen
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas , TX 75226
214-827-8301
Web Sites : www.ericneilsenphotography.com
http://e.neilsen.home.att.net
----- Original Message -----
From: "Don Bryant" <dsbryant@telocity.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Tuesday, February 05, 2002 4:19 AM
Subject: RE: Ferric Oxalate
> Eric,
>
> > There was much discussion at the time about this finding.
>
> I'll look that up in the archive.
>
> > From my recollection, it was derived based on B&S ferric oxalate
> powder that had been prepared to the liquid state and then altered
> additionally with "extra" ingredients.
>
> Is there a difference in the B&S F.O. powder and that which is obtained
> elsewhere? I vaguely recall a message by Jeffery Mathias that compared
> different F.O. concentrations.
>
> > Some of the discussion was based on the Sp Gr of ferric oxalate. I
> can not reflect on that attempt as I have been making my own since 1993.
>
> Is manufacturing F.O. difficult?
>
> > There should be no down side that I recall from adding either of the
> two components mentioned. The >oxalic acid is one of the components
> that I use to make it and has been written up early text as a offering
> preservative properties.
>
> So do you use these additives?
>
> >Some time back I did find that an early batch of ferric oxalate did
> precipitate a hard white substance after an addition of EDTA tetra
> sodium for which Richard had no insight. I removed it and continued to
> use it with no problem.
>
>
> I assume you mean you removed the percipitate.
>
Either way I suppose, as long as "use it" means the FO : )
> Don Bryant
>
>
>
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