From: Peter Marshall (petermarshall@cix.co.uk)
Date: 02/04/02-02:16:21 PM Z
> Greetings list members.
>
> I am new to this list, so if I am doing something that goes against your
> norms - please be gentle with me!
>
> I am wondering if anybody knows the chemical processes involved in the
> Vandyke process. Specifically, I am wondering if the dark part of the
> image is composed of iron or iron salts.
>
> What I would like to do is to find a process which leaves it's image in
> the form of Iron, and to use this to print on a piece of Oak. Oak is
> stained black by Iron, and I would therefore be able to use the process
> to put an image into the wood, as opposed to leaving an emulsion with
> the image on the surface of the wood.
>
> Mark
>
>
>
Mark,
The image is metallic silver, formed by reaction of silver ions with
iron(II) ions. The light sensitive chemistry involves the reduction of
iron(III) to iron(II).
Peter Marshall
Photography Guide at About http://photography.about.com/
email: photography.guide@about.com
_________________________________________________________________
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and elsewhere......
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