[alt-photo] Re: platinum

[EJ Photo]

David, To me the real question is what color is the solid/precipitate? If is
red crystals, than follow the normal path that Cor has mentioned. If the
prec is grayish/blackish then all the heating in the world will only make
more of it. Occasionally, your solution may have solid particles of pt in it
either from the manufacturing process or by repeated over heating. 

There is one well known reseller that I have seen weak and all too often
particles of solid PT in the solutions made from their chemicals. Always
mix, filter and keep a lid on the bottle to help prevent evaporation since
that too will put you in cycle of even more saturated, needing more heating.




Eric Neilsen
Eric Neilsen Photography
4101 Commerce Street, Suite 9
Dallas, TX 75226
 
www.ericneilsenphotography.com
skype me with ejprinter
www.ericneilsenphotography.com/forum1
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
C.Breukel at lumc.nl
Sent: Monday, December 20, 2010 3:12 AM
To: alt-photo-process-list at lists.altphotolist.org
Subject: [alt-photo] Re: platinum



> -----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 David
> Ashcraft
> Sent: maandag 20 december 2010 5:13
> To: The alternative photographic processes mailing list
> Subject: [alt-photo] platinum
> 
> I have a bottle of platinum solution that has solids at the bottom of
> it.  I'm wondering if I should try to get it back into solution or
> what other course of action I should take?
> 

David,

Usually these Pt solutions are near saturation, a drop of temperature
can precipitate Pt. Warming up to solution till around 40degC or so
could help,

Best,

Cor
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