Re: bubbles in gelatin (fwd)

• To: alt-photo-process-l@sask.usask.ca
• Subject: Re: bubbles in gelatin (fwd)
• From: Judy Seigel <jseigel@panix.com>
• Date: Thu, 12 Oct 2000 02:39:29 -0400 (EDT)
• Comments: "alt-photo-process mailing list"
• Reply-to: alt-photo-process-l@sask.usask.ca

---------- Forwarded message ----------
Date: Thu, 12 Oct 2000 01:48:04 -0400
From: Sil Horwitz <silh@cfl.rr.com>
To: Judy Seigel <jseigel@panix.com>
Subject: Re: bubbles in gelatin

At 2000/10/11 10:47 PM -0400, you wrote:
>Kremer Pigments makes a defoaming agent which is very helpful in suppressing
>bubbles in gelatine emulsions.  Only a few drops per 500 ml. batch are needed.

There is a long list of mfrs of polysiloxane defoamers (plus others) at:

http://www.siu.edu/~weeds/adjuvants/antifoam_agents.htm

The polysiloxanes (and most variants) are inert in most photographic 
solutions. If you have a real need, the big chemical companies represented 
would probably send you a few ml sample rather than try to sell a small 
quantity.

<<sil>>
<silh@psa-photo.org>
<webmaster@psa-photo.org>
Sil Horwitz, FPSA
Technical Editor, PSA Journal
check out <http://www.psa-photo.org>
personal page: http://home.earthlink.net/~silh/

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