From: Linas Kudzma ^lt;[email protected]>
Date: 05/02/04-08:02:16 AM Z
Message-id: <>

EDTA is ethylenediaminetetraacetic acid. The tetrasodium form has all four
acetic acid groups of the molecule neutralized to the sodium salt. The
disodium has two neutralized and two acidic groups per molecule. They are
not the same and the pH of the respective solutions are different as Sandy
pointed out. I use a solution of ETDA Disodium as a clearing agent for
Pd/Pt, and it works VERY well. A solution of EDTA Tetrasodium alone,
without some acidic additive, is not as good a clearing agent for Pd/Pt.


> [Original Message]
> From: Christina Z. Anderson <>
> To: Alt List <>
> Date: 5/1/2004 5:56:38 PM
> Subject: EDTA
> Cleaning darkroom time!
> I have EDTA Tetra and then EDTA Disodium; are they interchangeable and/or
> can I mix them in one container?
> Chris
Received on Sun May 2 08:11:24 2004

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