From: Sandy King (sanking@clemson.edu)
Date: 10/26/03-05:19:24 PM Z
I am potentially interested in both things. However, for starters a
quick-and-dirty test for the presence of silver metal in a print
would tell me if further investigation is warranted.
Sandy
>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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