[Alt-photo] oxalate ferric problem

bobkiss caribsurf.com bobkiss at caribsurf.com
Mon Mar 7 04:00:52 UTC 2016


I have never had any problems with reheating my FO soln during the 3 or 4 day dissolving process.

----- Original Message -----
From: "alt-photo-process-list at lists.altphotolist.org" <alt-photo-process-list at lists.altphotolist.org>
To: "alt-photo-process-list at lists.altphotolist.org" <alt-photo-process-list at lists.altphotolist.org>
Cc: "jusdado" <jmjusdado at gmail.com>
Sent: Saturday, March 5, 2016 5:17:55 PM
Subject: Re: [Alt-photo] oxalate ferric problem

El 05/03/16 a las 22:09, Keith Schreiber via Alt-photo-process-list 
escribió:
> Sullivan specifically recommended dancing to Chubbie Checker! Part of the magic I guess.;)
>
> The EDTA and oxalic acid are not necessary, though I too have been using them for many years. I just did a test with and without and found that exposure time was slightly faster with the additives, Dmax was slightly higher without them. The latter part of this is contrary to what I and most everyone else have believed about this for as long as I can remember. I think the difference is pretty much insignificant though, so I am not trying to discourage anyone from using them.
>
> There are a couple of articles on the B&S website that you might find interesting if you are not already familiar with them. They are actually rather old but undated. I think it is all drawn from things Sullivan had published elsewhere in the '80s and '90s.
> All About Ferric Oxalate <>
> The Care and Feeding of Ferric Oxalate <>
>
> According to Dana at B&S, repeated cycles of heating and cooling do more harm than good.
>
> Ferric oxalate is the cheap part of these processes. If your stock is really from 2003, I strongly recommend replacing it. If you meant 2013, it might still be useable. My old supply was from 2012 or 2013 and I am giving up on it.
>
> ~ Keith

Thanks Keith, I'll go to site B & S to read all about the ferric oxalate.
I confirm my Oxalate is 2003.
Thanks again.
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