From: Sarah Van Keuren (svk@steuber.com)
Date: 06/27/00-07:44:46 PM Z
> It's a wonderful process. If only the prints lasted longer...
>
> Gwen Walstrand
>
Thanks for reporting on your vandyke experiments, Gwen. I keep thinking that
residual iron salts could be removed with EDTA to avoid discoloration of
highlights. A former student of mine, a photographer who is mature and
careful, treated half a vandyke print like a platinum/palladium print,
putting it through 3 baths of EDTA which theoretically, should chelate out
the iron salts that originally formed the image. He put the two halves of
the vandyke on his windowsill and masked half of each half. The piece that
went through the EDTA actually changed more on the sunny windowsill than the
unchelated piece according to him. I should do my own experiments but have
not been committed enough to vandyke to go to the trouble but now with
palladium so expensive I am tempted to do whatever I can to find a
substitute. Too bad that selenium toning won't make the image itself more
permanent but maybe the sulfides or polysulfides that Judy referred to would
work. Anybody able to help with this?
Sarah
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