From: Carl Weese (cweese@earthlink.net)
Date: 09/05/02-09:22:31 PM Z
The color of a Pt/Pd print doesn't come from dyes or pigments, it's from
interference patterns of light refracting from the very small particles of
metal. You aren't seeing the color of the particles, but the effect of their
size on light. One of the scientists on the list can give a better
description of that I'm sure, but I don't see any way you could make this
produce the equivalent of "process colors" for CMYK printing.---Carl
--
web site with picture galleries
and workshop information at:
http://home.earthlink.net/~cweese/
----------
>From: Nash Computer Technology <nashcom@btinternet.com>
>To: alt-photo-process-l@sask.usask.ca
>Subject: Dumb question about chemistry
>Date: Thu, Sep 5, 2002, 2:20 PM
>
> I've just been daydreaming, and got to wondering about whether it's
> possible to make a
> coloured platinum print. I suppose this is because I can succesfully
(debatable!)
> produce ziatypes, and my one attempt at making a tri-colour gum bichromate
print
> ended in failure - I really must make time to have another bash.
>
> I'm 'thinking' aloud here, but if the developed and cleared ziatype print
> is made up of
> differing densities of deposited platinum/palladium, then if it were
> possible to change
> the colour of the actual platinum/palladium before making the chemical
> solutions (to
> each of CMY process colours), the final print would be of varying
> intensities of that
> colour. Is this crazy?
>
> Does adding chemicals such as sodium tungstate for a 'warmer' tone print
actually
> 'colour' the platinum/palladium 'grains' (if that's the correct term), or
> does it do
> something different? Thinking about coloured metals, apart from
> spraying/painting,
> which only coats the exposed surface, I can only think of anodizing as a
method of
> changing their colour. I don't know how this works - is it electrolysis
> (or is that a method
> of hair removal? !), and if so can it be carried on platinum/palladium, and
> would it cause
> each particle of these metals to change colour?
>
> If you've managed to read this far, then 'thanks'. As you've probably
> guessed, I wasn't
> interested in chemistry at school. I'm pretty good at making a fool of
> myself, though....
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