RE: Potassium Oxalate

From: nze christian ^lt;christian_nze@hotmail.com>
Date: 07/23/04-01:45:18 AM Z
Message-id: <BAY1-F19xcudImviHes000917e5@hotmail.com>

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 @ 70F with the concentrated developer and 5
min. @ 70F with a half strentgh developer.

Amicalement
best regards

Nz 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 01:45:33 2004

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