[alt-photo] Re: Replacing film silver with palladium

[Richard Knoppow]

----- Original Message ----- 
From: "Mustafa Umut Sarac" <mustafaumutsarac at gmail.com>
To: <alt-photo-process-list at lists.altphotolist.org>
Sent: Thursday, August 05, 2010 3:20 PM
Subject: [alt-photo] Replacing film silver with palladium


>I am communicating with few retired  kodak research people 
>and I became
> awated of something new to me.
> It is bleaching bw film and than replacing silver with few 
> metals.
> I want to bleach my 120 film bw slides and replacing 
> silver with palladium ,
> platin or gold.
> Anyone knows something ?
>
> Thank you ,
>
> Mustafa Umut Sarac
>
> Istanbul

     Well, I don't know about replacing exactly but there 
are toners that replace silver with some metals. Iron-Blue 
and Copper toners for instance. Both are less stable than 
silver. The silver can be converted a sulfide or selenide 
but is still a silver compound. Gold toners are supposed to 
"plate" the silver with gold but I don't think that's a 
correct explanation. Gold toned images are very stable as 
are silver sulfide and silver selenide ones.
     There are platinum toners for printing out paper. I 
don't think they replace the silver with platinum but are 
more like the gold toner. I have never seen a platinum toner 
formula for conventional printing paper or negatives but one 
might be possible.

--
Richard Knoppow
Los Angeles, CA, USA
dickburk at ix.netcom.com