From: Eric Neilsen (e.neilsen@worldnet.att.net)
Date: 03/08/03-06:03:22 PM Z
Perhaps you can do two things for me Erich. Please tell us what you
mean by "real platinum" and how does one get NH4 from sodium and
potassium? I don't have a copy of TNPP but it is quite impossible to
make sodium turn into ammonium by putting it in a shared vessel under
darkroom conditions.
Eric Neilsen Photography
4101 Commerce Street
Suite 9
Dallas, TX 75226
http://e.neilsen.home.att.net
http://ericneilsenphotography.com
-----Original Message-----
From: Erich Camerling [mailto:e.camerling@freeler.nl]
Sent: Wednesday, March 05, 2003 2:00 PM
To: alt-photo
Subject: Re: platinum questions
Kerik,
With real platinum printing,called *extravagatype* by Sullivan and Weese
in
their book "The New Platinum Print",it is impossible to use "Na2"
(Na2PtCl6)
as a contrast agent because you will get a precipitate of (NH4)2PtCl6
before you can coat .
Erich.
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