From: Philippe Ayral (payral@club-internet.fr)
Date: 05/14/01-08:27:18 AM Z
"Jeffrey D. Mathias" wrote:
> Philippe Ayral wrote:
> > Yesterday night I prepared some more Oxalate Potassium developer to
> > replenish the one I use,
> > so I dissolved 300g of Potassium Oxalate in 1000 ml of demineralized hot
> > water (the one in supermarket).
> > I already used that Potassium Oxalate stock to prepare the developer I
> > use for months now.
> > Everything was OK and the solution absolutely transparent but this
> > morning, when I wanted to store the bottle, all the stuff is
> > crystallized at the bottom of the bottle.
> > What is the problem ?
> > Is there a way to put back in solution and to keep it?
>
> What is the storage temperature?
20° C or 68-70° F
>
> It is also a good idea to use amber or brown bottles as used developer
> likely contains light sensitive material.
I always do
>
>
> I assume that you have crystallization in the unused solution.
> I usually mix about the same as you and have seen some crystallization,
> but not much, and certainly not enough to think it was substantially
> weakened.
Yes it's in the new one prepared, I don't have any in the used one
>
>
> If it is only a little, add some more water.
> If it is a lot, then consider it may be contaminated and make a new
> batch.
It's amost ALL the Potassium Oxalate I put in. I try to know where is the
problem before making a new batch and having the same problem.
> --
> Jeffrey D. Mathias
> http://home.att.net/~jeffrey.d.mathias/
Thanks for your help
-- Ayral Philippe 52, rue de Vallard 74240 Gaillard France Tél/Fax: +33 (0)450 39 79 81 http://www.focale.ch
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