From: James Young (jamiehy@globaldialog.com)
Date: 06/27/00-08:46:36 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
I'm curious what people have found about how long van dykes last? Has
anyone done tests? I've heard that it should be as permanent as
regular silver processes. Jamie
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