From: ken watson (watsok@frii.com)
Date: 09/06/01-08:00:28 PM Z
There are books on how gelatin emulsion is made. Some historical and some
relatively modern ( Agfa I think ) emulsions in photo process books in
college libraries. I would be more specific but the book is back in the
Library.
Basically it is adding silver nitrate and bromides and iodides while
stirring melted gelatin. I think for high speed the silver nitrate was added
in three steps, across 15 minutes of constant stirring to allow
aging/ripening. The longer the aging the larger the grains, the faster the
speed. Do not remember the percentages off the top of my head.
..-----Original Message-----
..From: spgjmf@uclink4.berkeley.edu [mailto:spgjmf@uclink4.berkeley.edu]On
..Behalf Of Jeffrey M. Foster
..Sent: Thursday, September 06, 2001 5:35 PM
..To: photo
..Subject: speaking of plates
..
..
..Has anyone coated their own dry plates?
..I have tried liquid light on 5x7 window glass and it
..sorta worked. I was hoping for a faster emulsion.
..Anyone know a formula?
..
..If I can make my own plates and print via hand coated
..papers, who needs the kodaks and Ilfords....
..
..I hope to try wet plate one day.
..
..thanks folks,
..Jeff
..
..Just joined this list last week. be doing photo in one form or
..another for 15 years...do cyanotype and large format for about 3 now.
..staying with the fine art historic processes....
..
..Jeff
..
..--
..
..Jeff Foster (Jeff 1)
..SDA UNIX, 257 Evan Hall
..UC Berkeley 2.8552
..
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