Potassium Oxalate( Re: Clearing Pt/Pd prints)

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From: Eric Neilsen (e.neilsen@worldnet.att.net)
Date: 04/06/00-06:09:14 PM Z

John, I use 2 lbs of Potassium Carbonate (mono) and 1.75 lbs Oxalic Acid.
First dissolve the potassium carbonate in about 2 1/2 quarts ( 2500ml) of
water. I use distilled or similar quality here is help keep my product as
clean as possible. Then slowly add the oxalic acid with stirring. It will
bubble quite energetically, as it gives of CO2 and heat. You may consider
doing this outside, but a good lab should handle it just fine. When you have
added enough oxalic acid, the bubbling will stop. Top off to make 1 gal. I
usually add an extra 150 g to the fresh batch to keep it on the acid side.

Ej Neilsen

JOHN A ROSEBOROUGH wrote:

> Eric,
> Please tell us how to make Potassium Oxalate. Not being a chemist,I would
> think that its not that hard. Or can you give a reference that's simple and
> easy to understand.
>
> TIA,
> John Roseborough
> Pyro for hire.
> -----Original Message-----
> From: Eric Neilsen <e.neilsen@worldnet.att.net>
> To: alt-photo-process-l@sask.usask.ca <alt-photo-process-l@sask.usask.ca>
> Date: Wednesday, April 05, 2000 4:29 PM
> Subject: Re: Clearing Pt/Pd prints
>
> >"Jeffrey D. Mathias" wrote:
> >
> >> Study of the clearing of Pt/Pd prints <SNIP>
> >
> >>
> >> S; Sodium Sulfide; 20 grams per 1000 ml water (2% solution)
> >
> >I believe you meant Sodium Sulfite! not Sulfide.
> >
> >As for the rest, good work. I would ask if you checked into the
> possibility
> >of adding Oxalic acid to the developer and to monitor the pH of your
> develop
> >to see what amount of Oxalic acid should or could be added to a Potassium
> >Oxalate developer to help prevent the formation of compounds that might
> lead
> >to fogging rather than calling for fresh developer? And are you making or
> >buying your potassium oxalate? Making it can save one many dollars as it
> >cost about 1/8 the purchase price to make it and it is easy to add extra
> >oxalic acid to your mix as it is one of the two components.
> >
> >Thanks for sharing
> >
> >
> >EJ Neilsen
> >--
> >Eric J. Neilsen
> >4101 Commerce Street, Suite #9
> >Dallas, TX 75226
> >214-827-8301
> >http://e.neilsen.home.att.net
> >http://www.ericneilsenphotography.com
> >
> >
> > 

--
Eric J. Neilsen
4101 Commerce Street, Suite #9
Dallas, TX 75226
214-827-8301
http://e.neilsen.home.att.net
http://www.ericneilsenphotography.com

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