safety film

noun
Photography. a film having a nonflammable base of triacetate cellulose.

Origin:
1925–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
safety film
 
n
photographic film consisting of a nonflammable cellulose acetate or polyester base

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
All of the nitrate material has been transferred to safety film and then the
  safety film duplicated.
On the arrival day, hunters will watch a safety film and then be issued hunting
  and fishing licenses.
All nitrate negatives have been reformatted onto safety film.
It is possible to purchase new scans and other types of copies made from safety
  film negatives and transparencies.
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