U of S | Mailing List Archive | alt-photo-process-l | RE: Ferric Oxalate or Ferric Ammonium Oxalate

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 Kas×m 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.