From: Joachim (joachim@microdsi.net)
Date: 02/15/01-06:26:55 PM Z
Be warned! Nitrate based film of the pre-safety film era, at least in
larger amounts as in reels of movie film, is subject to spontaneous
combustion in closed and warm circumstances. If it must be stored, do so in
well ventilated cool storage. Joachim
-----Original Message-----
From: Robert W. Schramm [mailto:schrammrus@hotmail.com]
Sent: Thursday, February 15, 2001 6:49 PM
To: alt-photo-process-l@sask.usask.ca
Subject: Re: Glass Plates
Judy,
Saw your post and can give you some info. Cellulose Nitrate is another
name for guncotten. I believe it is made by treating cotten with nitric
acid. It will detonate but burns slowly. It can be dissolved in ether or
ethyl ether. Cellulose nitrate disolved in ethyl ether is also called
collodian. Wet plate photogs coated a glass plate with it and then dipped it
in silver nitrate. I have a bottle of it somewhere which I think I bought
from Photographer's Formularly. Use in a well vented area for obvious
reasons.
It was one of the first practical plastics. Originally used to make
billiard balls, shirt collars for men and as a base for motion picture film.
It is not stable and deteriorates with time. Its flammable nature resulted
in some terrible fires in film storage vaults. It was replaced by "Safety
Film."
Bob Schramm
>From: Judy Seigel
>Reply-To: alt-photo-process-l@sask.usask.ca
>To: alt-photo-process-l@sask.usask.ca
>Subject: Re: Glass Plates
>Date: Wed, 14 Feb 2001 23:06:06 -0500 (EST)
>
>
>
>On Wed, 14 Feb 2001, Richard Knoppow wrote:
> > You will probably have to coat the glass with a substrate of cellulose
> > nitrate to get the emulsion to stick.
>
>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...
>
>thanks for any info...
>
>Judy
>
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