There are different concerns for kallitype than for platinum/palladium. If
you were to make up a batch of ferric oxalate from powder, using oxalic acid
to get it into solution. You should be able to add small amounts of ferric
nitrate to smaller batches as needed to clear it of excess oxalate prior to
use. I recall several ferric oxalate conversations; 1994 or 95 than again
in 2000. It is a reoccurring theme. I do recall seeing purple crystals in
B&S ferric powder over the years when I used it ( not since 1993 or so). I
did pick up some ferric nitrate from Dick back in 1993 or 1994 to test the
theory of excess oxalate. I don't recall the extend of testing. I did do
some kallitypes back then, as well as pt/pd to test the solutions.
I would also ask if they are putting any EDTA in their powder. I ran test
about that same time early 90's, and made some rather insoluble white
crystal in my ferric oxalate solution with the addition of EDTA tetra
sodium. But that was in a clear solution of home brewed, straight to liquid,
ferric oxalate.
Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://ericneilsenphotography.com
_____
From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
Sent: Saturday, January 21, 2006 7:46 PM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Dissolving Ferric Oxalate Kallitype
>From what I've read I was lead to believe oxalic acid in the emulsion was an
contaminant which had to be treated with ferric nitrate until it was no
longer a problem. I'll try the archive. Do you know approximately what
date/year this thread went through?
~m
----- Original Message -----
From: Eric <mailto:e.neilsen@worldnet.att.net> Neilsen
To: alt-photo-process-l@sask.usask.ca
Sent: Saturday, January 21, 2006 5:48 PM
Subject: RE: Dissolving Ferric Oxalate Kallitype
Michael, Oxalic Acid will set up the ferric powder to go into solution. I
believe that 2g is a very safe place to start. Jeffrey has posted on this,
and I think that you'll find that a little excess oxalic acid will help your
ferric last longer; not convert to ferrous.
Are you concerned about excessive oxalate running around in your ferric? Or
the pH level and its effect on image color?
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com
_____
From: Loris Medici [mailto:mail@loris.medici.name]
Sent: Saturday, January 21, 2006 3:48 PM
To: alt-photo-process-l@sask.usask.ca
Subject: RE: Dissolving Ferric Oxalate Kallitype
One more point: I presume you used distilled water for making the solution;
maybe your distilled water and/or the bottle was contaminated somehow (I
always rinse my bottles with copious amnt. of distilled water before
using/reusing them). Try to add some drops of silver nitrate soln. to some
drops of your distilled water and see if it precipitates or forms a cloudy
soln. (Well, even if it stays clear it may not show the water is fine - I
don't have that much chemistry knowledge to suggest a better test... But if
it gets cloudy, then you'll definitely know that there's a problem with your
water!?).
Regards,
Loris.
_____
From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
Sent: 21 Ocak 2006 Cumartesi 21:24
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Dissolving Ferric Oxalate Kallitype
Thanks Eric. Good point. I'll drop Claire a note and see I'm just seeing a
neutral sediment or if it really takes that long. No, I did not add any
Oxalic Acid, why, what would that do? I noticed the Pt/Pd formulas call for
it but I didn't see that mentioned for Kallitype.
~m
----- Original Message -----
From: Eric <mailto:e.neilsen@worldnet.att.net> Neilsen
To: alt-photo-process-l@sask.usask.ca
Sent: Saturday, January 21, 2006 11:09 AM
Subject: RE: Dissolving Ferric Oxalate Kallitype
It may be normal for their FO. Did you ask them? (JPPhotochem)
Did you add any Oxalaic Acid to the powder before mixing?
Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://ericneilsenphotography.com
_____
From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
Sent: Saturday, January 21, 2006 10:18 AM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Dissolving Ferric Oxalate Kallitype
I'm in day two of trying to get ferric oxalate to go into solution. I've
made a batch of 50 mls. I've tried microwaving for 20-30 seconds (warm as a
cup of coffee, 50 C maybe) and then shaking the bottle for five minutes. I
get a milky solution. After about 10 minutes it separates out and I get a
nearly clear liquid on top and a chalky sediment on the bottom. I've
repeated this at least 15 times in two days. The sediment just isn't budging
yet. Is this normal?!
~m
----- Original Message -----
From: Loris <mailto:mail@loris.medici.name> Medici
To: alt-photo-process-l@sask.usask.ca
Sent: Saturday, January 21, 2006 6:07 AM
Subject: RE: Dissolving Ferric Oxalate Kallitype
Maybe you can put the bottle in warm (40 - 50C?) water and shake the warm
solution. It may help to dissolve the remaining FO. I mixed FO only once
(but hadn't the opportunity to use it - I dumped it a year later, without
testing... because I've read that it goes bad in 3 months). Mine was
dissolved completely after two days just with the initial shaking/stirring -
I didn't visited the solution once I mixed it. Two days later there wasn't
any precipitate in the bottle. My FO was from B&S.
Regards,
Loris.
_____
From: Michael Koch-Schulte [mailto:mkochsch@shaw.ca]
Sent: 21 Ocak 2006 Cumartesi 02:40
To: Alt-Photo-Process-L
Subject: Dissolving Ferric Oxalate Kallitype
It's been over 24 hours since I mix my first batch of Ferric Oxalate (20%).
I still have about a quarter to half an inch of "sludge" at the bottom of a
100 ml bottle. I've been intermittently shaking the bottle when I get the
chance. Should just "stay the course" or is intervention required? Also, how
pronouned is the white precipitate when doing the test for presence of Free
Oxalic Acid. I'm not sure if I'm seeing just a milkly scum from the
undissolved Ferric Oxalate or precipitate. Ferrix Oxalate was obtained from
jdphotochem. Thx.
~m
Received on Sat Jan 21 22:48:14 2006
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