U of S | Mailing List Archive | alt-photo-process-l | Re: formula for platinum standard solution #3 ?

Re: formula for platinum standard solution #3 ?



Hi Keith,

Many thanks for your response and the formulas.

Yes, your assumption about what I would like to attempt is correct.

At this point, I think I'll just keep the powdered ammonium
tetrachloroplatinate for ammonium pt. printing (which was the reason
for its purchase originally0 but still look forward to other potential
responses.

Thanks again,

Tom
On Jul 13, 2009, at 12:23 PM, Keith Schreiber wrote:

Hi Tom,

If I understand your question correctly, you have ammonium
tetrachloroplatinate in either powder or liquid form, from which you
want to make the traditional standard Pt solution which is 20%
Potassium Chloroplatinate (K2PtCl4). I'm no chemist, but I don't
think it is possible, at least not without somehow removing the
ammonium. Sodium chloride is definitely not involved. That is
probably why you can't find a formula.

From Arentz, the formula for making the standard Pt solution from
powdered K2PtCl4 is:
50 ml distilled water @100
10 gm potassium chloroplatinate

From Ware & Malde, the formula for making ammonium
tetrachloroplatinate from powder is:
5 gm ammonium tetrachloroplatinate (II)
20 ml distilled water

You probably have these formulas already and were hoping to find
something else, but I don't think it exists. Maybe one of the
chemists on the list will chime in.

Hope this helps,
Keith

www.jkschreiber.com


On Jul 11, 2009, at 7:52 PM, Tom Hawkins wrote:

Listmembers,

Could someone provide the formula for platinum standard solution
#3, using ammonium tetrachloroplatinate?

Many thanks,
Tom


Tom Hawkins
tomehawk@ix.netcom.com

www.tomhawkinsphotographs.com





Tom Hawkins
tomehawk@ix.netcom.com

www.tomhawkinsphotographs.com