From: Niranjan Patel (niranjan.patel@worldnet.att.net)
Date: 10/26/03-04:42:18 PM Z
Sandy:
Are you looking for a quick-and-dirty test you can do in your darkroom as a
way of process control or trying to gain fundamental understanding of
scientific value?
If the latter is the case, one way would be doing SEM (scanning electron
microscopy) on various samples in conjunction with EDS (energy dispersive
x-ray) analysis which can detect presence (and relative amounts) of
different elements on the grains. You should be able to deduce answers for
both your questions from the results. Of course, this requires sending out
your prints to a custom analytical lab or a materials lab of an university
if you have access to one.
Niranjan.
----- Original Message -----
From: "Sandy King" <sanking@clemson.edu>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Sunday, October 26, 2003 5:14 PM
Subject: Test for Silver Metal in Print?
> I have two questions for anyone on the list who might be able to
> share some knowledge.
>
> The issue is this. For some time I have been making platinum and
> palladium toned kallitypes. Some of the literature on toning
> indicates that during metal toning the more noble metal plates the
> less noble one. Other literature indicates that the more noble metal
> actually replaces, either completely or in part, the less noble one.
>
> What I would like to know is this.
>
> 1. How would one be able to find out whether when toning a silver
> image with gold, palladium or platinum the toning action is resulting
> in plating or in replacement of silver metal?
>
> 2. Assuming that toning with gold, palladium and platinum results in
> replacement of silver metal, how would one test for the presence of
> silver to verify whether the replacement is partial or complete.
>
> Sandy King
>
>
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