[Phono-L] Kinetoscope film inquiry Value?

[Andrew Baron]

Thanks Bill for these clarifications.  I'll take a look at the article.

Best,
Andy


On Aug 23, 2008, at 7:20 PM, Bill Burns wrote:

> ClockworkHome at aol.com wrote:
>
>> Some of the films were on nitrate film stock rather than acetate
>> safety film. Any old film that has a smell of vinegar usually means
>> that it is nitrate and becoming unstable.
>
> This isn't quite right; it's *acetate* film that smells of vinegar.
>
> Three bases have been used for film, in historical order:
>
> Cellulose Nitrate: Highly flammable. On decomposition it produces  
> nitric
> oxide, nitrogen dioxide, and other gases, which may be irritating to  
> the
> eyes, nose, and throat.  Does *not* smell of vinegar.
>
> Cellulose Acetate: Not particularly flammable, produces acetic acid as
> it decomposes (hence the vinegar smell); the film base also shrinks  
> and
> wrinkles.
>
> Polyester: The modern base, strong and stable.
>
> This Wikpedia article gives much more detail:
>
> http://en.wikipedia.org/wiki/Film_base
>
> -- 
> Bill Burns
> Long Island   NY   USA
> http://ftldesign.com
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