RE: Avoiding gelatine

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From: Jacek Kosciukiewicz (jacek@gdansk.home.pl)
Date: 07/29/02-01:19:37 PM Z

You can try solution of polyvinyl alcohol. You should dilute 150 g of solid
compound in 1 liter of cold water (demineralised). Stirr it intensively
while putting alkohol to the water. Leave mixture overnight to soake. After
that heat mixture from a few up to even 12 hours in water bath (cover, not
very tightly, vessel with solution to avoid water evaporate). This emulsion
works well with gum bichromate and cyanotypes (this I tried with success).
You can store raw emulsion at least e few months. If you add 3 tablets of
Aspirine (powdered) to the mixture while heating, storing time extends up to
12 months. Of course in cean conditions.

Good luck

Jacek

-----Original Message-----
From: Richard Knoppow [mailto:dickburk@ix.netcom.com]
Sent: Thursday, July 18, 2002 11:15 PM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Avoiding gelatine

At 12:54 PM 07/18/2002 -0400, you wrote:
>
>I'm pretty sure that the modern gelatin in photographic use today does not
>use animal substances. Maybe someone else on this list that's better
>informed can tell us.
>
  Its the same old stuff, gotten from animal hides and bones. Some modern
films use a mixture of Gelatin and synthetic polymers. I don't think any
emulsion is yet made completely of synthetic polymer.
  Natural gelatin has some properties which are very hard to duplicate. 

----
Richard Knoppow
Los Angeles, CA, USA
dickburk@ix.netcom.com
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