Since I have some
history on using copper in alternative printing ( see
my little article in Post Factory # 9 as well as here
), I was very interested in a variant designed by Jim
Patterson ( kindly shared through Christina Anderson on the list).
Jim coined his variant
gave his method a try, and I am realy pleased with the result (although
I only did one short printing session). I think it's realy an
improvement compaired to my method (whch was actually designed by Chris
Patton). The advantages beeing realy clean highlights and contrast
control through AmmoniumDichromate (did not try that with my method, I
assume that it will work). There is also no need to coat the paper
first with agar. A slight disadvantage is that the process "consumes"
quite some chemistry (although not very expensive), and takes some time
in post processing (especially the last step washing out the
potassiumferricyanide takes time and attention)
Click on the images to
obtain a larger one
4*5 MACO IR film
(prototype), 89b red filter, at 6 ASA,
Paper: Simili Japon
Coating: 2 * 200 ul sensitiser
+ 1,5 ul AmmoniumDichromate
+ 1 ul
(dried after first coating),
Exposure : 14 minutes under home made UV bank.
Processed according Jim Patterson
coating as above.
Half a stop less exposure (10 min)
1 minute Amidol toner
The Amidol toner intesifies about half a stop
Nice colour shift from red/brown to purple/redd/egg-plant colour
Exposed at 250 asa,
2* 1ml +10 ul Tween20
+ 10 ul Ammonium Dichromate (20%)
Exposure: 30 minutes.
(this negative has a to high Dmax, increasing exposure more
lowers contrast, but the shadows do not get stronger, perhaps because
the printing out effect. The shadows already form during exposure and
prevent further deepening).
Amidol toning nicely balance this effect
Cor Breukel, 29/10/2007