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

RE: Ferric Oxalate or Ferric Ammonium Oxalate



Sandy,

Yes, that is all you need to make the Ware formulations. You will notice
that his metal salt concentrations are slightly higher than is typically
used in DOP. I have used the ammonium tetrachloropalladate for DOP
printing as well. I think it has a visually deeper Dmax and a more neutral
tone than the sodium salt version.

Clay

>
> 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
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> 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.
>