Re: Oxalic Acid for Pt./Pd.

From: Ryuji Suzuki ^lt;[email protected]>
Date: 09/15/04-06:58:13 PM Z
Message-id: <>

From: Don Bryant <>
Subject: RE: Oxalic Acid for Pt./Pd.
Date: Wed, 15 Sep 2004 20:39:18 -0400

> I recall a discussion long ago about the pluses and minuses of using a ph
> meter. But I'm wondering if using indicator strips might be a better and
> perhaps more reliable method for measuring ph.

That applies to highly silver-reactive chemicals such as developers
and toners for silver gelatin process. For measuring the pH of plain
potassium/sodium oxalate, I don't see a problem and a cheap pH meter
should work fine. Maintenance, calibration, etc. are the same, though,
so you might want to think one-and-half times before deciding to buy a

By the way, since then, I found a cheap and durable pH measurment
solution for darkrooms including silver gelatin processing chemistry,
certainly good enough for routine checks, with initial cost around
US$100. (for both meter and electrode; but you have to buy them
separately and I don't know of an online source who carries both. It's
certainly not a "one click" solution but for those who really need
that type of set up.)

Ryuji Suzuki
"You have to realize that junk is not the problem in and of itself.
Junk is the symptom, not the problem."
(Bob Dylan 1971; source: No Direction Home by Robert Shelton)
Received on Wed Sep 15 18:59:02 2004

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