I don't combine these two processes so I defer to those who have made this work.
Test a cyanotype with hypo to gauge what its effect will be on the combination print.
With that said...I would think hypo is needed. Since hypo is a solvent for unreduced silver (halides) it would make sense that long term image stability would require removing unexposed silver. But we are working with silver nitrate or whatever we end up with once we add the tartaric acid. and how much of the final image is comprised of iron?
We VDBers need a good thorough treatise like Dr. Ware wrote for the cyanotype. Does such a book exist?
On Wed, Apr 8, 2009 at 1:25 PM, Weber, Scott B <email@example.com>
Still wondering if the hypo is
needed for the VD layer.
have had students do this successfully, if you expect weird results. I
posted three to my website that were done last year.Erika Skogg did a whole
final project of these and they were most intriguing.
used to assign it to all students and actually I really liked what they
produced, but it was an iffy proposition requiring time and attention that we
were short on so now I require them to do combotypes of their choosing--either
gum/pd, pd/cyano, gum/cyano, salt/gum, etc.
back to VDB/cyano--students who are successful do it a couple different
ways: overexpose the cyano layer first, or dilute the VDB half with
water, or a layer of size between the cyano and the VDB of 1/3 gesso,
acrylic matt medium, and water.
is the benefit of teaching, no? I scan/photo all student work, so I have
ready examples--thousands of them--to illustrate processes. I should
really just set up a website of all their incredible work. This last
month has been all gum and the lab is just glutted with prints hanging all over
the place, prints soaking, and as is usual their "failures" are the
ones I find most delectible.
Original Message -----
Sent: Tuesday, April 07,
2009 6:24 PM
Sorry, Scott, you are dealing with a redux reaction, oxidation of
the VanDyke by the Cyanotype. Occasionally I have been able
get results that seem to last a while (by using larger concentrations of Van
Dyke but when I have gone back a couple years later to the prints I found that
they had been eaten up by the blue dye. Try using Cyanotype over palladium or
platinum, that works. .If someone has been able to make it work, I would
also like to hear about it. Joachim
From: Weber, Scott B [mailto:firstname.lastname@example.org]
Sent: Tuesday, April 07, 2009 7:03 PM
I have been making cyanotypes and have tried putting a layer
of Van Dyke over and really like the result. Question; do I need to fix the VDB
layer with hypo. This seems to bleach out the cyan layer a bit. Or is there
some other cause?
Scott B. Weber
Associate Professor of Photography
Department of Fine Arts
Miami Shores, Florida
305 899 4922
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