RE: A question of chemistry?

Your proportions are not correct. You should use them at a ratio of 2 parts
Potassium Carbonate to 1.75 parts of Oxalic Acid by weight. I normally work
in lbs and oz for this mixture and 2 lbs Pot Carb and 1.75 lbs Ox Acid mixes
to make 1 gallon of solution. Off the top of my head, I don't recall the %
solution this makes.

Eric Neilsen Photography

4101 Commerce Street, Suite 9

Dallas, TX 75226

214-827-8301

http://ericneilsenphotography.com

  _____

From: kismet [mailto:samba@superonline.com]
Sent: Thursday, July 14, 2005 4:44 PM
To: alt-photo-process-l@usask.ca
Subject: A question of chemistry?

Hi,

I need your help to know the amounts of oxalic acid and potassium carbonate
to get a solution of 33% of equivalent potassium oxalate. Actually I am
preparing potassium oxalate developer for Pt/Pd prints by mixing some
130grams of oxalic acid and 125g of potassium carbonate to have a total of
1liter of aquous solution. I feel that this is more dilute than 33%.

In the past I used to mix my developer directly with potassium oxalate at
33%, but now as I can not find it easily and at a good price, I prepare it
from pot.carbonate and oxalic acid.

Thank you for your valuable knowledges.

Best

Mehmet Kismet
Received on Thu Jul 14 16:07:13 2005