[Alt-photo] Re: Longevity of Pt/Pl chemistry after being mixed?

[EJ Photo]

Francesco, I would say to do this for your self. Mix an amount of those
solutions you currently use; maybe 4 times a normal print. Keep it for a
week and then make some prints and test it against the color and speed of
the same from freshly combined chemicals.  In my experience, the combined
mix of FO and PT/PD mix printed faster and warmer but your results may be
different. Since I don't know where you get any of your chemistry nor at
what strength you use it, it is impossible to say for sure. The FO is the
part that can go bad, create a fog. Remember it is a new solution with a new
equilibrium, so you must do it your self. 

I did not run test for storage longer than a few days - 4  to 5. 

Eric Neilsen
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
 
www.ericneilsenphotography.com
skype me with ejprinter
Let's Talk Photography
 
-----Original Message-----
From: alt-photo-process-list-bounces at lists.altphotolist.org
[mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf Of
Francesco Fragomeni
Sent: Monday, December 09, 2013 7:19 AM
To: alt-photo-process-list at lists.altphotolist.org
Subject: [Alt-photo] Re: Longevity of Pt/Pl chemistry after being mixed?

Yes to clarify, I don't mean the longevity of the individual parts
independent of one another. I mean the longevity of an actual coating
solution once mixed i.e the Platinum, palladium, and ferric oxalate 1 and 2
mixed together and ready for the paper.
 On Dec 9, 2013 5:46 AM, "Philippe Ayral" <payral at gmail.com> wrote:

> Question was about coating solution when *they are mixed into coating
> solutions and then stored*
>
>
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> 2013/12/9 Eric Nelson <emanphoto at gmail.com>
>
> > The metals should last indefinitely but the FO goes off after 6 months
or
> > so. I remember this from when I used to buy premixed FO many years ago
> > e
> >
> > On Dec 9, 2013, at 11:39 AM, Francesco Fragomeni <fdfragomeni at gmail.com>
> > wrote:
> >
> > > Hi All,
> > >
> > > Just a quick question here. Will platinum, palladium, and the ferric
> > > oxalate degrade if they are mixed into coating solutions and then
> stored?
> > > I'm thinking about an experiment in which a larger than usual amount
> of a
> > > coating solution will be mixed and will need to be stored but I don't
> > want
> > > to waste time and money on this if the mixed solutions wont last.
> > Basically
> > > paper will be floated on the solutions which is why larger amounts
need
> > to
> > > be mixed and then stored in between printing sessions.
> > >
> > > Any insight? Will there be any issues with mixed solutions being
> stored?
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