RE: Pt./Pd. question acid pre-soak

Mark, you could have added some oxalic acid directly to your developer and
most likely continued to use it.

Eric Neilsen Photography

4101 Commerce Street, Suite 9

Dallas, TX 75226

214-827-8301

http://ericneilsenphotography.com

  _____

From: Ender100@aol.com [mailto:Ender100@aol.com]
Sent: Tuesday, August 09, 2005 1:02 PM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Pt./Pd. question acid pre-soak

Kerik,

I would agree. I tried some FAEW and used an oxalic acid presoak with it.
I got good prints, but switched back to COT 320 because I did not like
having to do the presoak. Once I began printing with the COT 320 again, I
noticed I was not getting as good as results as before and determined that
the Potassium Oxalate that I was using had somehow changed drasticly when
using the FAEW. My guess was that it had gone very alkaline and PH tests
supported this. I threw out that batch of Potassium Oxalate and mixed fresh
developer and experienced no further problems.
Mark Nelson
Purchase the eBook & PDN System for Your Own Custom Digital Negative
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In a message dated 8/9/05 11:39:29 AM, kerik@kerik.com writes:

I'm not interested in getting in a chemistry debate here. Note I said
*apparently* and perhaps I should have said alkaline rather than
*buffered*. But, I use a pH test pencil (Google it if you want to see one)
to check the pH of papers. I realize this is a rough estimate and there
are probably better and more precise ways to measure this, but FAEW shows
higher pH prior to acid treatment than most other papers I've tried.
Received on Tue Aug 9 12:08:15 2005