[alt-photo] Re: platinum

[Paul Viapiano]

David,

As Cor mentioned, pt and pd solutions are near saturation, so it's normal to 
see some precipitate. It doesn't mean that there will be less metal salts on 
the print/paper, to the contrary, your liquid is saturated with as much 
metal as it can hold.

Paul


----- Original Message ----- 
From: "David Ashcraft" <davidashcraft at sti.net>
To: "The alternative photographic processes mailing list" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Monday, December 20, 2010 11:34 AM
Subject: [alt-photo] Re: platinum


>I will take a look but I know the pt isn't old and lately it has been  cold 
>in the dkrm so probably heating the solution will do the trick.
>
> My supplier said to use up the liquid and then add distilled water to  the 
> leftovers to make more solution.  If the pt is coming out of  solution 
> then there will be less of it on the paper, correct?    Wouldn't this 
> affect the prints or printing in some way?
>
> Thanks, David
>
> On Dec 20, 2010, at 6:09 AM, EJ Photo wrote:
>
>> 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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