From: ken watson (watsok@frii.com)
Date: 01/03/02-07:58:33 PM Z
I did have time to visit one University Library, their SPIE journals ended
around 67 so I need to check another. I did run across a good book called
Photographic Emulsion Chemistry. It is very detailed in the interactions of
the components of the emulsion but lacks a recipe. What is the time frame
for copy right? If it is expired I could OCR this book and post it for
all to use. It would be very good for trouble shooting. The more
interesting thing I read ( superficially ) was single-jet vs dual-jet
ripening. There was a comment that Lippman used dual-jet ripening as it
offered 1 micron sized grains. This emulsion was apparently clear vs cloudy
as the grain size was so small.
Thanks to Richard M. Koolish, he seems to have found the best recipe I have
run across online . I have looked at the dye transfer site ,
www.dyetransfer.org and they did have detailed info on how to make gelatin
emulsion in order to make DIY matrix for this process. I am somewhat
concerned, though, in that they want thick coatings and I believe ( need to
read again) they have about half the silver typically found in regular
negative film / plates. One thing did come to mind from reading this. On
the other hand , I have been interested in carbon printing because of the
texture that can be had with this process. Since Dye Transfer DOES
inherently have texture in the matrix. It seems texture may be possible
using similar processing as Dye transfer, only with the object of making a
textured silver print.
Thanks again to Richard Knoppow for offering up additional books for me to
search for. Anyone that may have books on the subject, that are beyond the
copy right and care to have them OCR'd I am willing to do the work...unless
we are talking over 200 pages or so.
As a tip for those who may want to OCR a book. I have found that if I
actually copy it , enlarged, on a Xerox machine and then scan it in, these
enlarged copies it seems to work quite well. I can adjust the density /
exposure to compensate for problems ( darkened / yellow paper ) while
Xeroxing if necessary. I also get two pages on each side of the paper and
the book gets back into the library with out late fines due to my lack of
diligence.
..-----Original Message-----
..From: Richard Knoppow [mailto:dickburk@ix.netcom.com]
..Sent: Thursday, January 03, 2002 2:22 PM
..To: alt-photo-process-l@skyway.usask.ca
..Subject: Re: emulsion formulas
..
..
..At 03:08 PM 01/03/2002 -0500, you wrote:
..>There was a thread a few days ago about making your own emulsion.
..>
..>I found some formulas for photographic emulsions at
..>http://artnavigator.tripod.com/emulsions3.htm
..>
..>I think there was a web page at Kodak about this also, but have been
..>unable to find it again.
..>
.. Many years ago Kodak published a formula for a general purpose slow
..emulsion. I don't have a copy and don't remember where it was published,
..probably in a brochure.
.. There are two old books which are the standard texts on emulsion making
..and which have practical formulas. Both are hard to find but a
..good library
..should be able to get them.
.. Most emulsion making technique, at least until pretty recently, was
..shrouded in great secrecy. Patent protection has been much more
..widely used
..in the last twenty years than in the past but I suspect much of the actual
..technique is still considered proprietary.
.. The two old books are:
..
.._Photographic Emulsions_ E. J. Wall, 1929, Boston, The American
..Photographic Book Publishing Co.
..
.._Emulsion Technique_ T. Thorne Baker, 1941, Boston, American Photographic
..Book Publishing Co.
..
..There is also a second edition of the above, 1948, same publisher.
..
.. A more recent book is:
..
.._Photographic Emulsion Theory_ George F. Duffin, 1966, The Focal Press
..
.. A cursory search of the on-line catalogue of the Los Angeles City library
..shows a number of more recent books treating directly on emulsion
..chemistry. I know of at least two translated from Russian published by
..Focal Press. I suspect the University of California libraries have more.
.. Books like _Theory of the Photographic Process_, C.E.K. Mees, have
..descriptions of the basic process and chemistry but have little detail.
..Mees and T. H. James were employed by Kodak and had knowledge of
..proprietary processes. Mees make clear that he can't go into details.
.. Modern emulsion making may be very much advanced over the techniques
..described in these books. Some hints can be found in patent
..literature, but
..its a long search. I think for simple demonstration purposes, or simple
..applications Baker or Wall will prove useful.
..
..----
..Richard Knoppow
..Los Angeles, CA, USA
..dickburk@ix.netcom.com
..
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