Re: Extravagatype and Na2

[Linas Kudzma <lkudzma@earthlink.net>]

Erich,
  Interesting results. I've never tried mixing K2PtCl4 and Na2PtCl6
solutions alone to see what happens. I normally start with the AFO, then add
the K2PtCl4 solution and then add the Na2PtCl6, which is when I get the
precipitate. Lately, I've gotten away from printing Extravagatype. Sometime
I will look in the chemical literature to see if the solubility of
(NH4)2PtCl6 and K2PtCl6 is published.

I mostly print normal develop-out Pd/Pt with Na Palladium/Na2PtCl6/ferric
oxalate and  never see any precipitation.

Linas

----- Original Message -----
From: "Erich Camerling" <e.camerling@freeler.nl>
To: "alt-photo" <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, May 15, 2002 1:18 AM
Subject: Re : Extravagatype and Na2


> Linas,
> I think you are right when you suppose that the precipitate is
(NH4)2PtCl6.
> When I mix 1 drop Ammonium Ferric Oxalate (40 g / 100 ml ) with 1 drop
> Na2PtCl6 ( 20 g / 100 ml ) there immediately arises a precipitate.
> When I mix 1 drop K2PtCl4 ( 20 g / 100 ml ) with 1 drop of Na2PtCl6  ( 20
g
> / 100 ml ) there slowly arises a precipitate but less then with AFO + Na2.
> Unfortunately I don't know the solubility data from K2PtCl6 and
> (NH4)2PtCl6.I only know that K2PtCl6 is nearly insoluble.I called for data
> to Drijfhout ( famous Dutch precious metal supplier,present
Engelhard-Clal )
> after  searching   in the Gmelin : part Pt,
> but even they didn't have data.On Internet I also couldn't find data.
>
> Erich
>
>
>