RE: Potassium Oxalate developer for Platinum printing

From: Breukel, C. (HKG) ^lt;C.Breukel@lumc.nl>
Date: 04/25/06-04:12:25 AM Z
Message-id: <CE29D3825485344B9909EEADF243B0740106D558@mailc.lumcnet.prod.intern>

Hi Eric

>
> You can also use Oxalic acid to keep your developer on the acid side
of
> life.

..I checked the pH of my PotOX devleoper, and it's about 7.2, what
should the pH be?..

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.

...would filtering be a helpful?..

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.

..roughly how many say 8*10 prints can you develop with say 1 litre of
25% PotOX. And do you think that a used developer gives better
results...

Thanks & best,

Cor

>
> 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 04:12:43 2006

This archive was generated by hypermail 2.1.8 : 05/01/06-11:10:26 AM Z CST