RE: Trivia time: room temperature solubility of platinic acid

Maybe in my brevity I should have included a platinum (oops palladium) terms
like the recent Gum thread. When I used Na, it meant Sodium the element;
when I used Na2 that was in reference to the contrast agent. Those would
have two different impacts on a print.

Na2 can also be part of the chemical expression for the palladium salt,
Na2[PdCl4]. That is not how Na2 was being used here.

Clay, have you see your mixed prints, platinum and palladium, showing the
same quick cool down? Or only those where the only metal salt was
Na2[PdcCl4]? And have any of you, seen a significant cooling of a print made
with NH4 as your base for the palladium solution? Or for lithium?

I agree with everyone about Na2 - it takes only a small
> amount to
> significantly cool down a palladium print, ceteris paribus

I haven't seen it with my ammonium palladium prints. It may be that with all
palladium prints made with sodium based palladium only, that ceteris
paribus, applies. I would also add that before one can start attributing
too many characteristics to a particular part of a palladium print, all
components need to be listed and accounted for. The ferric oxalate will play
a roll in the color of your print. The full interaction of all the
components have not been tested by me recently, but about 6 years ago,
sutble differences in color could be achieved by using a ferric oxalate from
B&S, The Formulary, Artcraft or my homemade brew.

The color shift may in part be due to interactions not based on sodium but
pH changes. We all wait your test.
  

Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
214-827-8301
http://ericneilsenphotography.com
> -----Original Message-----
> From: Clay [mailto:wcharmon@wt.net]
> Sent: Friday, December 09, 2005 5:33 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Trivia time: room temperature solubility of
> platinic acid
>
> I'll let you know. The stuff is still in a small plastic bag in
> the
> form of crystals. So experimentation is forthcoming.
>
> I agree with everyone about Na2 - it takes only a small
> amount to
> significantly cool down a palladium print, ceteris paribus.
>
> Clay
> On Dec 8, 2005, at 11:46 PM, Eric Neilsen wrote:
>
> > Well, Yes. Perhaps my point missed both you and Sandy. Does
> the Na2
> > produce
> > prints of warmer color than prints made using Platinic Acid,
> where
> > the Na is
> > replaced in the compound by H. Discounting the effect that PT
> would
> > have on
> > the image tone by cooling it down a bit, and since the same
> amount of
> > platinum is in both the magical Na2 and in Platinic Acid,
> what then
> > accounts
> > for any difference in image color?
> >
> > So Clay, have you used both? What say ye?
> >
> > Eric Neilsen Photography
> > 4101 Commerce Street
> > Suite 9
> > Dallas, TX 75226
> > http://e.neilsen.home.att.net
> > http://ericneilsenphotography.com
> >
> >> -----Original Message-----
> >> From: Kerik [mailto:kerik@kerik.com]
> >> Sent: Thursday, December 08, 2005 5:52 PM
> >> To: alt-photo-process-l@sask.usask.ca
> >> Subject: Re: Trivia time: room temperature solubility of
> platinic
> >> acid
> >>
> >> On Thu, 08 Dec 2005 17:18:43 -0600, Eric Neilsen
> >> <e.neilsen@worldnet.att.net> wrote:
> >>
> >>> In fact I can see no reason why it wouldn't
> >>> work as well or better than Na2. Better? More neutral. Na
> has a
> >>> tendency
> >>> to warm up palladium prints, so I'd expect the elimination
> of it to
> >>> reduce the warmth of your print.
> >>
> >> Hmmm... no. Na2 causes Pd prints to shift towards neutral.
> >>
> >> Kerik Kouklis
> >> www.kerik.com
> >
Received on Fri Dec 9 07:57:35 2005