[alt-photo] (re-post): Re: potassium hexacholorplatinate?

[C.Breukel at lumc.nl]

I had trouble posting to the list it seems, here a message I have sent on Monday, might be interesting for the archive..

..............................................

Let me add my experience:

I did perform mentioned reduction of K2(PtCl6) to K2(PtCl4) it is not very hard to do, providing you have the right equipment, and the resulting solution works fine for Pt printing, as far as I can tell (and you are really doing platinum printing, not as quite often use only or mainly Palladium and say it's is a Platinum printing...;-)..)

2 points though: it is kinda hard to judge if all the K2(PtCl6) is reduced to the Cl4 form. On my first try I ended up whit nice red crystals, which I assumed to be the divalent (II) form. But the resulting prints were of very high contrast, so I assumed that there was still some tetravalent (IV) present, and that it served as a contrast agent just like the Na2PtCL6 compound.

So I reduced a bit further until I saw a fine black precipitate (pure Pt) and used that for Pt printing (the solution of K2(PtCl4) offcourse; this stuff is still going strong after 5 years (although I recently filtered off some more pure Pt, probably the reduction very slowly goes on..) The purist might shudder about this (Jeffrey are you still around..;-)..)

Another problem is that it is quite hard to determine how much solid Kt(PtCl4) you have in the end. I solved it by freeze drying the stuff (I realize that that is not in reach for everybody) and solid impurities are that also taken in account offcourse..

So Dan, if you do not want to have it, I'll be in line after Erich..

Best,

Cor


-----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 Loris Medici
Sent: zondag 10 januari 2010 20:42
To: The alternative photographic processes mailing list
Subject: [alt-photo] Re: potassium hexacholorplatinate?

For the reference:
http://www.usask.ca/lists/alt-photo-process/2003/feb03/0358.htm

Notice the disclaimer in the end.

Thanks Erich. (May use that in the future if I come across K2PtCl6...)

2010/1/10 Erich Camerling <e.camerling at tiscali.nl>:
>
> Hi Dan,
> on the  12th of February 2003 I wrote how to reduce K2(PtCl6) to 
> K2(PtCl4) (It is Cl 6 instead of C 16.Cl is chlorine,C is 
> carbon)`.K2(PtCl6) is NOT suitable for Pt printing.If you don't like 
> to do the chemistry I will,so you can steer his generosity in my 
> direction.But give you reaction to me OFF LINE.
> Kind regards
> Erich
>
>
>
> Dan Burkholder schreef:
>>
>> Hi All,
>>
>> Is potassium hexacholorplatinate (K2PtCl6) suitable for platinum printing?
>> I've always used the Pot. Chloroplatinite (K2PtCl4) and have no idea 
>> what the difference is. If I can use the former but it needs some 
>> different mixing instructions, please clue me in.
>>
>> A kind person is offering to give me some of the "16" material but if 
>> it's better for some other use, I'd like to steer his generosity in 
>> the right direction.
>>
>> Many thanks for any and all info and tips!
>>
>> Dan
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