When I made combination van dyke & cyanotype prints, I printed &
processed the cyanotype first. I then coated the van dyke, printed, &
processed. The cyanotype that was under the VD showed up as lighter
areas. The unexposed areas of VD that were coated over the cyanotype
bleached out the cyanotype, leaving traces of the brushstrokes from
application. Pretty nice effect. I would say most of all just
experiment & use the good ol' trial & error. What works for some may
not work for others. You may find your own results that are quite
pleasing.
~Brit
On 8/12/05, Judy Seigel <jseigel@panix.com> wrote:
>
>
> On Fri, 12 Aug 2005, Ryuji Suzuki wrote:
>
> > From: "Weber, Scott" <sweber@mail.barry.edu>
> > Subject: blue vandykes
> > Date: Fri, 12 Aug 2005 15:01:59 -0400
> >
> >> Does anyone have advice for combining cyanotypes and van dyke printing? I
> >> have seen a few examples and like the combination of colors. I tried a few
> >> the other day and found that the cyan on top of the vdb bleaches out the
> >> brown image. Any help is appreciated.
> >
> > When this was brought up a few weeks ago, I suggested two possible
> > methods to overcome this problem. One is to use polysulfide treatment
> > after Van Dyke before cyano. Another is to use Fuji Ag Guard
> > treatment, similarly after VDB before cyano.
> >
> > This bleaching is most likely due to oxidation of the metallic
> > silver. Unlike silver gelatin, silver is not protected by gelatin,
> > which makes the VDB silver image more susceptible to all sorts of
> > oxidative attacks. The two methods I suggested are known to make
> > silver more resistant to oxidation.
>
>
> One of the ingredients in cyanotype, potassiium ferricyanide, is a silver
> bleach. So a more common approach is to coat, expose & develop the
> cyanotype first, which doesn't entirely eliminate, but definitely
> mitigates the bleaching problem -- see for instance Donna Hamil Talman's
> item on what she calls "Cyanodyke," Post-Factory #7, page 17.
>
> Control is not perfect -- but in return, colors may be marvelous -- and
> unexpected.
>
> J.
>
Received on Sat Aug 13 02:11:04 2005
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