From: Bob Mazzullo (rmazzullo@si.rr.com)
Date: 01/01/02-09:16:30 PM Z
Hello Ken.
Contact Jim Browning on the dye-transfer list (you'll have to subscribe to
this
list at dyetransfer@yahoogroups.com) he has done extremely in depth work
regarding making silver iodobromide gelatin emulsions, right down to the
coating machinery involved. You have to see the manual to believe it. It
gives
every last detail you would need to get started, and to further experiment,
if necessary.
Please note: This manual was originally written to produce matrix film for
dye transfer,
but the methods may be applicable to what you need.
Good luck,
Bob M
> -----Original Message-----
> From: Tox Gunn [mailto:tox@remarque.org]
> Sent: Tuesday, January 01, 2002 9:21 PM
> To: alt-photo-process-l@skyway.usask.ca
> Subject: Re: making Gelatin Emulsion
>
>
> The SPIE conference proceedings from the Holographic Materials
> and related
> conferences of the late 90's have information on this - browse the stacks
> at your local college library. Based on their articles, I've been slowly
> getting the materials together. (This is incidentally also a pretty good
> place to start looking for Lippmann photography information -
> some of Hans
> Bjelkhagen's articles are excellent overviews.) Seems that university
> students have been doing more work in homebrewed plates in the
> last several
> years since the commercial holography offerings from Agfa narrowed. The
> best article on emulsion synthesis I've found was by some
> students in Japan
> in 1998 or so, who did tests of a dozen different sensitizers and a dozen
> differing concentration/ripening schedules - when I find the paper again
> (my apartment is currently a pit), I can post the cite if you would like.
>
> Some things to keep in mind:
>
> I've not found a good source for the sensitizing dyes - minimum
> quantity is
> usually off-scale and the issue of direct sales to individuals has gotten
> no easier since 9/11. Example - for one of the cyanine series dyes I was
> looking at, for a batch of a couple dozen plates I would have needed ~2ml
> of a 1:1000 w/v sol'n in ethanol but the dye was sold in units of 1 gram
> powdered for ~$120, and only if I were associated with a manufacturer or
> university.
>
> Glass plates may need be subbed before coating with the emulsion.
>
> The impression I get from the lit is that the coating method and
> consistency may have a lot of personal variability. Some
> decisions to make
> include: spin coating vs. spreading with a meyer rod, coating
> platewise vs.
> coating a large sheet and cutting it down, etc.
>
> If you get there before I do, please share your notes and
> observations!..;)
>
> Good luck,
> Tox
>
>
> At 06:27 PM 1/1/2002 -0700, you wrote:
> >Does anyone on this list know where to find recipes for making gelatin
> >emulsion?
> >
> >I am not looking for liquid light which seems slow from today's point of
> >view, maybe it is mostly silver chloride? I am looking to make
> a relatively
> >modern silver bromide/iodide asa 25 to 125 B&W emulsion to coat glass
> >plates.
> >
> >The more in depth of how to actually process, digest , sensitize
> the better.
> >
> >.
>
>
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