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Re: Permanency of VDB (test)
At 02:56 PM 7/19/00 +0200, you wrote:
>Like many others I have been wondering about the permanency of VDB
>prints. So I did a little test. I partly covered a reject print with
>black paper and stuck it to my window, facing the sun for a couple of
>hours each day (well, on sunny days). That was in December last
>year. Today (after more than 7 months) the window cleaners dropped into
>my office and so I thought it may be time to have a closer look at what
>has happened to the print. Here is the result:
>
>http://www.uni-konstanz.de/FuF/Philo/Philosophie/Fuhrmann/themen/VDBtest.jpg
>
>The scan faithfully reproduces the print (at least on my screen). I would
>describe it as follows: The fading is only vvvery slight. It is more
>like putting a silver print through Farmer's thus enhancing
>contrast. More noticeable than the fading is the alteration in tone. The
>exposed part has assumed a warmer brown. So in sum: the print has become
>slightly more contrasty and warmer in tone. With many images that could
>be an improvement. In such cases we should not speak of faded but of
>matured vandykes ;-)
>
>Please note that I deliberately underfixed the print -- after all I wanted
>to test a worst case scenario. I washed only a few minutes and fixed for
>1 minute in plain hypo 2% followed by a 20 minutes wash.
>
>André
Andre
Thank you for posting this print. I've been wondering about this
myself. Palladium is getting way too expensive and I have been considering
alternatives.
Does anybody have any experience or comments on the argyrotype process?
Thanks,
Bob
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