May 2004 Alt Photo Process-L: FW: EDTA

From: Eric Neilsen ^lt;e.neilsen@worldnet.att.net>
Date: 05/02/04-01:18:24 PM Z
Message-id: <000401c4307a$3e256d00$51a0fea9@NEWDELL>

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com

Date: Sun, 2 May 2004 09:40:44 -0500
From: "Eric Neilsen" <e.neilsen@worldnet.att.net>
Subject: RE: EDTA
In-reply-to: <410-2200450214216364@earthlink.net>
To: <lkudzma@earthlink.net>
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I have mixed some together for clearing of platinum prints, and as Linas say
they do have different ph. Which is why I like to use straight Di sodium
first, a mix for my second and a Tetra sodium for my third clearing bath as
it has a pH that reacts less with the buffering agents in some papers.

Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com

> -----Original Message-----
> From: Linas Kudzma [mailto:lkudzma@earthlink.net]
> Sent: Sunday, May 02, 2004 9:02 AM
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: EDTA
>
> Chris,
> 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.
>
> Linas
>
>
> > [Original Message]
> > From: Christina Z. Anderson <zphoto@bellsouth.net>
> > To: Alt List <alt-photo-process-l@sask.usask.ca>
> > 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
> >
>

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I have mixed some together for clearing of platinum prints, and as Linas say they do have different ph.  Which is why I like to use straight Di sodium first, a mix for my second and a Tetra sodium for my third clearing bath as it has a pH that reacts less with the buffering agents in some papers.

Eric Neilsen Photography

4101 Commerce Street

Suite 9

Dallas, TX 75226

http://e.neilsen.home.att.net

http://ericneilsenphotography.com

> -----Original Message-----

> From: Linas Kudzma [<A HREF="mailto:lkudzma@earthlink.net">mailto:lkudzma@earthlink.net</A>]

> Sent: Sunday, May 02, 2004 9:02 AM

> To: alt-photo-process-l@sask.usask.ca

> Subject: RE: EDTA

>

> Chris,

> 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.

>

> Linas

>

> > [Original Message]

> > From: Christina Z. Anderson <zphoto@bellsouth.net>

> > To: Alt List <alt-photo-process-l@sask.usask.ca>

> > 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

> >

>

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Received on Sun May 2 13:18:36 2004