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Topic: Cans vs. No cans
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Gary Crawford
Jedi Master Film Handler
Posts: 979
From: Manassas, VA. USA
Registered: Jun 2003
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posted February 07, 2017 07:39 AM
The experts tell us that once the chemical reaction that produces VS begins, having the film totally enclosed in an airtight container increases the speed of the reaction...more gas, causing more reaction, causing more gas. And the cycle goes on. They tell me that allowing the film to breathe releases some of the gas and slows down the degeneration. And if the film is in a vented can, the sieves can absorb some of the gas more easily and slow down the process even more. I realize there is still debate about this, but that seems to be the consensus. Also, films vary in their susceptibility of vinegar based on the film base and on the quality of processing work done to produce them. Some may never get it, others seem to get it quick and fast. They say also that temperature and humidity are both factors affecting VS. In many chemical reactions , the warmer it is, the faster and stronger the reaction. There awre so many variables, it boggles my mind. So that's my BS about VS.
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted February 26, 2017 09:09 PM
There's an opposite school of thought here, namely that film storage in sealed or tightly fitting cans is the worst way to store films. The reason being that the films must be allowed to breathe, to avoid build up of decomposition gases from cellulose acetate. I don't know if there is any truth in this, but 3 years ago I went through an estate collection of 8mm and super 8mm films, and most of the films in metal cans had VS, and most of the films in cardboard boxes did not. Sine then I have stored all my films in card boxes.
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