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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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