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Re: platinum/palladium coating - exposing POP
Istvan, I would caution against premixing palladium lithium mixtures. I
have found it best to mix each coating solution just before use with any of
the lithium added as a component. Solutions which can sit for a little
while would be AFO and ammonium based platinum with or without any palladium
of the ammonium or sodium chlorides family.
Have fun :)
Eric J. Neilsen
4101 Commerce Street, Suite #9
Dallas, TX 75226
214-827-8301
http://e.neilsen.home.att.net
http://www.ericneilsenphotography.com
----- Original Message -----
From: "Istvan Bibo" <bibo969@hotmail.com>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Wednesday, April 18, 2001 3:23 AM
Subject: Re: platinum/palladium coating - exposing POP
>
>
>
> >From: Eric Neilsen <e.neilsen@worldnet.att.net>
> >Reply-To: alt-photo-process-l@sask.usask.ca
> >To: alt-photo-process-l@sask.usask.ca
> >Subject: Re: platinum/palladium coating - exposing POP
> >Date: Thu, 12 Apr 2001 22:44:38 -0700
> >
> >Istvan , Are you mixing your AFO and lithium in a batch and then
> >dispensing
> >small amounts for each coating? You also failed to mention your
procedure.
> >As this list has kicked around, there are many Blank o types when it
comes
> >to making what once might have been called a platinum print, so it is
> >important to trouble shooting to let us know what else you are doing.
> >
> >The glass may warm up to higher than acceptable levels. Rather than
> >several
> >contact frames, I use different pieces of glass. This not only lets the
> >glass cool back down after use, it allows me to set up another negative
for
> >printing with any light blocking mask, borders, etc, that the print
> >requires.
> >
> >I don't make many pure lithium palladium prints, but all that I recall
are
> >quite cool much like a platinum only print.
> >
> >I would also suggest that you can use a small fan to help remove the hot
> >air from under the light source. While your glass will still warm up
some,
> >this will help tremendously.
> >
> >Eric J. Neilsen
> >4101 Commerce Street, Suite #9
> >Dallas, TX 75226
> >214-827-8301
> >http://e.neilsen.home.att.net
> >http://www.ericneilsenphotography.com
> >----- Original Message -----
> >From: "Jeffrey D. Mathias" <jeffrey.d.mathias@worldnet.att.net>
> >To: <alt-photo-process-l@sask.usask.ca>
> >Sent: Monday, April 09, 2001 5:50 AM
> >Subject: Re: platinum/palladium coating - exposing POP
> >
> >
> > > Istvan Bibo wrote:
> > > > I use ammonium ferric oxalate and lithium palladium chloride. I have
> >the
> > > > problem of having only one deep black contrasty print (that i really
> >like)in
> > > > one printing session, the others are browner and less contrasty. I
was
> > > > trying to figure out, what made the difference,because the
conditions
> >were
> > > > kept the same.
> > > > Now I am almost sure that it was the freshness of the solution that
> >made
> >the
> > > > difference, because the unrepeatable black prints were the first
ones
> >in
> >the
> > > > sessions. ...
> > >
>
> Eric,
>
> Yes, I mix the sensitizer solution in a batch then I dispense it, that is
> why the later prints are produced with an "old" sensitizer. Hence my
> suspicion of its making the color different. I have no consistent
procedure
> yet (still experimenting), but I try to keep conditions the same in one
> printing session. In one session I dried the prints at the Rh of about 60%
> the next time I dried it with a hair drier and then exposed it.
> Overheating, for some reason, is not a problem for me. I use 4 black light
> tubes and they appearantly do not heat the printing frame significantly.
> When I used the sun to expose, the frame and the sensitized paper were hot
> indeed.
> Nevertheless the reason for the different color may be yet an other factor
> that I am not aware of. Variables are seemingly infinite in alt processes
> but that is the challange and the fun.
>
> Istvan
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>