I suppose the easiest thing would be to try the procedure without the alum.
I doubt that the hardener is even necessary given the short amount of time
the gelatin will be in water. I recently tried to put cyano on aluminum,
and also got lousy (but different results). I first sealed the metal with
acrylic varnish, then applied gelatin and chrome alum. Applied the cyano -
it went on OK and dried fine. After exposure I could see a the image, but
it was fainter than my trial run on paper. When I developed, it all
disappeared. Poof. Tested this with an extreme exposure, got an image and
it disappeared in the water. Gave up. But now you've got me thinking:
maybe I should omit the alum...
-----Original Message-----
From: Gordon J. Holtslander [mailto:holtsg@duke.usask.ca]
Sent: Thursday, April 01, 2004 2:23 PM
To: alt-photo-process-l@usask.ca
Subject: cyanotype II on glass
Hi:
A friend of mine is trying to do cyanotype II on glass. He is putting
down a layer of gelatin with chrome alum as a hardener, letting this dry
and then coating it with cyanotype II.
He says the cyanotpe goes on beautifully, but once it dries it crystalizes
and is insensitive to exposure.
We think its likely the chrome alum reacting with the cyanotype II - any
other ideas what would cause this?
Gord
---------------------------------------------------------
Gordon J. Holtslander Dept. of Biology
holtsg@duke.usask.ca 112 Science Place
http://duke.usask.ca/~holtsg University of Saskatchewan
Tel (306) 966-4433 Saskatoon, Saskatchewan
Fax (306) 966-4461 Canada S7N 5E2
---------------------------------------------------------
Received on Thu Apr 1 17:14:52 2004
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