Re: Potassium Oxalate

I would add that you should do this in a large sink in a well ventilated
room or out on the street - the stuff can get pretty bubbly.....

n

----- Original Message -----
From: "nze christian" <christian_nze@hotmail.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Friday, July 23, 2004 12:45 AM
Subject: RE: Potassium Oxalate

> Hi Sandy
>
> For making my own Potassium oxalate I first add 130 gm of acid oxalic to
500
> ml of water then I add 110gm of potassium carbonate I well mix . at this
> point there is still some powder in the solution. I then I add about 15gm
> more of potassium cabonate and the solution get clear. I check with a pH
> paper and add water to make 1 liter.
>
> You don't have to worry about the dilution. A more dilute developer work
as
> well as a concentrate one, you just have to change the developing time.
For
> example I develop 2 minutes @ 70°F with the concentrated developer and 5
> min. @ 70°F with a half strentgh developer.
>
>
>
> Amicalement
> best regards
>
> Nzé Christian
> mailto:christian_nze@hotmail.com
> http://www.c-nze.com
>
>
>
>
>
> >From: Sandy King <sanking@clemson.edu>
> >Reply-To: alt-photo-process-l@sask.usask.ca
> >To: alt-photo-process-l@sask.usask.ca
> >Subject: Potassium Oxalate
> >Date: Fri, 23 Jul 2004 00:33:05 -0400
> >
> >
> >I have found a number of directions for making potassium oxalate from
> >potassium carbonate and oxalic acid. The directions seem pretty straight
> >forward and the mixing does not appear to pose any danger. However, I am
> >confused about the percentage solution that is derived from the mixtures.
> >
> >So, assuming that I want to make a gallon of a 25% solution of potassium
> >oxalate for Pt/Pd printing, what amount of potassium carbonate and oxalic
> >acid should I start with?
> >
> >Sandy King
> >
> >
> >
>
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Received on Fri Jul 23 07:44:06 2004