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Re: platinum/palladium coating
>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
>Date: Fri, 06 Apr 2001 22:19:06 -0700
>
>
>----- Original Message -----
>From: "Jeffrey D. Mathias" <jeffrey.d.mathias@worldnet.att.net>
>To: <alt-photo-process-l@sask.usask.ca>
>Sent: Friday, April 06, 2001 8:58 AM
>Subject: Re: platinum/palladium coating
>
>I don't agree with this point. There are some mixtures that can sit for
>several hours and produce better prints. You can certainly premix your
>metal salts, but what ever you do, you will find that to get repeatable
>results in speed, contrast, color, it is best to do it the same from
>coating
>to coating. I have found that premixed sodium palladium and potassium
>platinum will give warmer prints with lower contrast than freshly added
>components to your ferric oxalate or ferric ammonium oxalate.
>
>EJ Neilsen
>
>
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. I will check this out in the near future.
Best
Istvan
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