From: D. E. Adin (adin@frontier.net)
Date: 02/15/01-09:11:48 AM Z
This fire hazard, by the way, caused many fires and explosions in the early
days. Thus, in New York we have the Photo district. (Gov't attempt to
control the fire hazard.)
This might be a good time to find an alternate method.
(pun intended)
Apologies.
Durango David
> At 2001/02/14 11:06 PM -0500, you wrote:
> >Hi Richard... do you know much about cellulose nitrate -- where
> you get it
> >for instance, how you spread it -- and solvent? I've been wanting to try
> >it for something else but so far didn't find much...
>
> Jumping in here. Cellulose nitrate is guncotton. To make a coating, it is
> dissolved in ether and a plasticizer (old-timers used camphor) added. The
> liquid emulsion is flammable and the dry product (celluloid) is
> explosive.
> Personally, I wouldn't touch it. Film base used to be made of this stuff,
> but it was substituted with cellulose acetate (whole different story) and
> that has been substituted in turn (by most manufacturers) with mylar and
> other plastic films, which are easier to handle as they are not hazardous
> materials requiring all kinds of precautions.
>
> If you want to make a cellulose nitrate coating, be sure you do it in a
> fume hood (ether is an anesthetic, as you know) with a great big fire
> extinguisher handy.
>
>
> Sil Horwitz, FPSA
> Technical Editor, PSA Journal
> teched@psa-photo.org
> silh@earthlink.net
> Visit http://www.psa-photo.org/
> Personal page: http://home.earthlink.net/~silh/
>
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