From: david distefano (zfd@lightspeed.net)
Date: 01/02/02-02:03:53 PM Z
this is an article i found on coating glass plates. don't know if this
helps?
http://www.edinphoto.org.uk/pp_mckean_recommends%20making%20your%20own%20plates.htm
david
ken watson wrote:
>
> Thanks for the replies. I have run across Holographic folks playing with
> emulsion but it was more along the lines of adjusting the sensitivity and
> development discussions around specific products. So if you find the
> specific article info on making emulsion I would be interested. I will also
> go visit a local university. I had come to an end and you guys have given
> me a few more trail's to follow, thanks.
>
> As for subbing a plate before coating. Albumen seems to still be a good idea
> but I also have read about using India rubber in Benzene or...can not
> remember the other solvent. This could just mean thinned rubber cement that
> is at a typical art supply house
>
> As for coating , I had planned to "roll" it on as did Eastman in his
> original process.
>
> As for dyes, I am only trying to make Orthochromatic emulsion. At the moment
> the Red insensitivity is a plus, so from what I have been able to read Ethyl
> Red dye will do this. It is available at relatively low cost for staining
> microscope slides. About $25 for 100 grams I believe . I looked into the
> other dyes for sensitizing lippman type of plates ( curiosity ) and it was
> in the neighborhood of $100 for the smallest amount of pure dye that I could
> find. As for direct sales issue to individuals, contact me off list and
> maybe I can help some:
>
> watsok@frii.com
>
> ..-----Original Message-----
> ..From: Tox Gunn [mailto:tox@remarque.org]
> ..Sent: Tuesday, January 01, 2002 7:21 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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