From: joel lederer (lederer613@earthlink.net)
Date: 09/05/02-03:33:40 PM Z
I really do think that this is feasible. The color of the material depends
on the way its molecules refract light. I've been told that a "cold" silver
print has larger grains of silver which give a bluer look and a "warm"
silver print has smaller grains and refracts more yellow light. Someone in
"the know" could probably have better ideas though.
Don't know about using the zia process (never done it) but here is an idea
to try-
After making the rgb sep. negs. use cyanotype for the cyan, a silver process
(like kallitype or whatever) for the yellow (minimal exposure to silver will
be yellow) and chrysotype (gold) for the magenta- (I've only gotten a maroon
from humid chrysotype but worth a shot)- if you need a black you could do
pt/pd from a contrasty neg.
This seems like more trouble than its worth, but if you could pull it off
you might get your name in some Guinness book of photo world records. I for
one would be impressed!
good luck
Joel lederer
> 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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