RE: Ferric Oxalate or Ferric Ammonium Oxalate
Title: RE: Ferric Oxalate or Ferric Ammonium
Oxalate
Loris,
I have Palladium II
Chloride powder on hand. Looking at Mike Ware's directions, it appears
that I can prepare Ammonium Tetrachloropalladate(II) by
mising ammonium chloride with palladum II
chrloride. Would this
be all I need, along with the FAO, to give Ware's POP method a try?
In other words, can a basic sensitizer be made with
just Ammonium
Tetrachloropalladate(II) and
Ammonium Ferric Oxalate, or do I need something else?
Also Is it possible to control
contrast with the Ware method with dichromate? I would rather do
this than attempt to do so by varying RH?
Sandy
At 9:01 AM +0200 11/3/06, Loris Medici wrote:
Hi Kerik,
Main salt: Li2PdCl4.
Metal additives (for color control - sometimes): K2PtCl4 and
KAuCl4.
Non-metal additives: NaOW and Amm.Di. (for contrast and color
control).
Regards,
Loris.
P.S. Your "reply-to" address is not empty, so I had to write
the group's
address manually.
-----Original Message-----
From: Kerik [mailto:kerik@kerik.com]
Sent: 03 Kasžm 2006 Cuma 08:24
To: alt-photo-process-l@usask.ca
Subject: RE: Ferric Oxalate or Ferric Ammonium Oxalate
Loris,
Which metal salts are you using with AFO?
Thanks,
Kerik
> -----Original Message-----
> From: Loris Medici [mailto:mail@loris.medici.name]
> Sent: Thursday, November 02, 2006 10:10 PM
> To: alt-photo-process-l@usask.ca
> Subject: RE: Ferric Oxalate or Ferric Ammonium Oxalate
>
> Hi Eric,
>
> I haven't done prints with FO other than few Kallitype tests
> so I can't share personal experience w/ it as a sensitizer
> for Pt/Pd salts but I'm quite sure that my prints don't
> exhibit any haze and/or highlight fogging and/or low
> contrast. Probably yours is a paper/clearing and/or negative
> DR problem - my usual coating mix gives me 29 steps in the
> 31-step tablet for instance (in other words my usual negative
> DR is log 2.9!).
>
> I'm currently using the same AFO sensitizer that I mixed
> about 10 months ago and it still works well without any
> fogging and/or speed change or other negative effect. IME AFO
> is quite stable even when in solution - you can almost think
> that it keeps indefinitely "especially when compared to
FO".
>
> Regards,
> Loris.
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