RE: Potassium Oxalate developer for Platinum printing

Thanks for the tips Sanday & Marek, I'll follow your sugestions, and
I'll let you know, it's good to hear that I do not have to throw the
developer out (yet)!

Best,

Cor

> -----Original Message-----
> From: Sandy King [mailto:sanking@CLEMSON.EDU]
> Sent: dinsdag 25 april 2006 17:14
> To: alt-photo-process-l@usask.ca
> Subject: RE: Potassium Oxalate developer for Platinum printing
>
> I print in kallitype and Pt./Pd. with both potassium oxalate and
> sodium citrate developers. To keep either developer working well I
> recommend.
>
> 1. Always mix with distilled water.
>
> 2. Replenish at the rate of a minimum of about 50 ml of fresh
> solution for every 8X10 print that goes through the solution.
>
> 3. Check the pH frequently to make sure it stays acidic. If the
> solution becomes base add oxalic acid (to potassium oxalate) or
> citric acid (to sodium citrate) to return the solution to acidic
> condition.
>
> If you do the above the developer should last a very long time.
>
> Sandy
>
>
>
> >Cor,
> >I do not print pure Pt, but in my experience of palladium/platinum
> >mix the developer lasts forever. I just replenish what was is lost
> >in a development session. Do keep your developer acidic, as it will
> >fog the paper otherwise. If you use buffered papers that might
> >require even more oxalic acid replenishment. I keep mine developer
> >with some undissolved acid on the bottom.
> >Le tus know how you solved your fogging problem.
> >Marek, Houston
> >
> >>From: Eric Neilsen <e.neilsen@worldnet.att.net>
> >>Reply-To: alt-photo-process-l@usask.ca
> >>To: alt-photo-process-l@usask.ca
> >>Subject: RE: Potassium Oxalate developer for Platinum printing
> >>Date: Mon, 24 Apr 2006 20:34:59 -0500
> >>
> >>Cor, Your developer will hold onto a portion of your coated area
that
> was
> >>exposed and not part of the print. This coated and very slightly
excited
> >>area will become part of that 500ml; which seems really skimpy to me
by
> the
> >>way. There are also buffers in the papers that can adversely effect
your
> >>developer. While you may only need 500ml to cover your paper, I'd
advise
> you
> >>to use a larger amount as a stock solution. If the cost of Potassium
> Oxalate
> >>powder is high in your area, I would make it from Potassium
Carbonate
> and
> >>Oxalic acid. Pour out the amount need to develop your print, and
after
> pour
> >>it back.
> >>
> >>You can also use Oxalic acid to keep your developer on the acid side
of
> >>life. You may also find that exposing your developer to UV light
and
> >>letting it sit, will allow you to remove the excess metals from your
> >>developer. The greenish quality is not a problem. Single shot
eliminates
> the
> >>chance of fog due to removed components from previous prints, but I
> don't
> >>find it necessary.
> >>
> >>You can use a lower concentration of Pot ox but you run the risk of
> graining
> >>up your prints. You will also need slightly more exposure.
> >>
> >>I have only tried brush development a few times, but I would look
into a
> >>good even pour ,just like for coating the sensitizer, and a quick
even
> >>dispersal of the coating, perhaps even by using a rod.
> >>
> >>Eric
> >>
> >>Eric Neilsen Photography
> >>4101 Commerce Street
> >>Suite 9
> >>Dallas, TX 75226
> >>http://e.neilsen.home.att.net
> >>http://ericneilsenphotography.com
> >>
> >>> -----Original Message-----
> >>> From: Breukel, C. (HKG) [mailto:C.Breukel@lumc.nl]
> >>> Sent: Monday, April 24, 2006 5:52 AM
> >>> To: alt-photo-process-l@usask.ca
> >>> Subject: Potassium Oxalate developer for Platinum printing
> >>>
> >>> (maybe you'll see this message for the second time, I did not see
it
> >>> appear..)
> >>>
> >>> Hi,
> >>>
> >>>
> >>> I have been using a 25% solution of Potassium Oxalate as my
developer
> >>> for Platinum printing (no Palladium added), and to my surprise
this
> >>> developer went "off" rather quikly. That is: in the 500ml I
started
> with
> >>> I could process only 5-7 8*10 images (did not keep exact count).
My
> last
> >>> print showed veiled highlights, which did not want to clear, and
the
> >>> PotOx solution is now very murky with a greenish brown strong
colour.
> >>>
> >>> I looked into dome books as well as in the archives, and the
things I
> >>> find are contradicting (no surprise I guess). Crawford (and
Farber
> who I
> >>> think quotes Crawford) claims that the developer keeps
indefinitely,
> and
> >>> has only be toped up with fresh developer to make up for the
loss. It
> >>> actually gets better when it's more used. James states about the
> same,
> >>> although he says that there is an end to the live of the
developer.
> >>> Jeffrey Mathias advices to use the developer single shot, reusing
> will
> >> > cause fog..
> >>>
> >>> Single shot seems a bit wasteful, as well environmental
unfriendly
> with
> >>> this toxic chemical, OTOH 6 8*10 prints with half a litre isn't
> exactly
> >>> economical either, plus the ruining of the last print.
> >>>
> >>> Can one use a lower concentration of PotOX, develop longer and
> discard
> >>> it afterwards?
> >>>
> >>> I did try brush development with glycerol: PotOx 1:1, but I
wasn't
> very
> >>> successful with that, got a lot of developer lines, will brush
> >>> development also work with FO, I have only read about it
connection
> with
> >>> AFO.
> >>>
> >>> Comments or suggestions/
> >>>
> >>> Thanks!
> >>>
> >>>
> >>> Cor
Received on Tue Apr 25 09:22:46 2006