>Don (jadlapp@aol.com) listed the chemistry and process in December 1996.
^^^^^^^^^^^^^^^
>It's in the archives....
I found in the archive:
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Jadlupp@aol.com
Fri, 6 Dec 1996 10:54:25 -0500
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Back in November, someone asked for information on the Mordancage process ,
and I never saw a reply. This past July, I was in France with the Maine
Workshop group, and we had a showing by Jean Pierre Sudre of typical
Mordancage prints. The next day, we had a hands-on workshop where we made
prints. Craig Stevens, (cgsteven@aol.com) has a handout that he uses in his
workshops, and I notice it has a copyright listed on it.
I suggest who ever it was that was interested request a copy from him.
The basic process is to bleach out a finished print in the copper
chloride-hydrogen peroxide -water solution for about 3 minutes, wash for 15
minutes, redevelope in weak or used dektol or sulfide toner, rinse and wipe
loose gelatin from the print, wash, let air dry so redeveloped silver can
oxidize.
Every paper works differently, each toner or dektol bath responds
differently, each image is different, so lots of notes help if you like a
certain effect.
The copper chloride must be dissolved in COOL or COLD water, as it generates
lots of heat as it goes into solution. Use 10 grams in 750ml water. SLOWLY
add 25 to 35ccs of 30 percent hydrogen peroxide (first challange - getting 30
percent peroxide! It is used by people who chrome plate plastic parts, but it
is very explosive if you aren't carefull). Then add water to make 1 liter.
The amount of peroxide is less for graded papers, more for variable contrast
papers.
Another option is cosmotoligist's hair bleach, which is 18 percent peroxide.
In that case, add 50 to 60ccs, then water to make 1 liter.
Any other questions, I suggest you ask Craig. All I know is that the effect
is very different from any other process. Almost looks like computer
enhanced work.
Don Upp
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Judy made the remark that the copper chloride could be replaced by the
-cheaper- copper sulfate.
The colouring via dyes -red congo, auramine etc.- is still not quite clear to
me, the redeveloping in Dektol or in toners is not meant by Christian Nze; what
I understood is: to soak the mordancaged print in a bath with a solution of
Borax with a dye like auramine and the areas which are not 'touched' by the
mordancage process, w.o.w. the highlights, will also not be coloured - or the
other way around, a matter of to be basic or not to be basic.
Henk
-- Henk Thijs tel: +31-(0)43-3661249 Eurocontrol Maastricht UAC fax: +31-(0)43-3661300 Horsterweg 11 email: henk.thijs@eurocontrol.be NL-6191 RX Beek(l) T h e N e t h e r l a n d s