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Subject: Nitrate


From: Ellen McCrady <whenry>
Date: Sunday, August 12, 1990
As for nitrate film, you have to bear in mind that nitrate  movie
film calls for different storage conditions than nitrate
photographs.  The movie film will self-ignite at about 104
degrees F (depending on how far gone it is), and is so hazardous
that it should not be stored in the same building with your other
stuff, or with any stuff at all.  It should have its own
building.  It should be inspected regularly so you can quick find
the money and facilities for copying any film that has gotten
into the Very Dangerous or Uncopiable stage.  It gives off
destructive gases that would affect other materials stored nearby
if it did not blow them up first.

Photographs, on the other hand, do not self-ignite or blow up. 
They do not last a long time, so they should be stored at low
temperatures and humidities (I think Henry Wilhelm recommends a
frost-free refrigerator).  They do give off destructive gases
that will affect other photographs and storage enclosures, so
they should be separated out and stored in stable envelopes or
other housing.  A copying program should be set up for them so
that you will not lose the images.  And the darkroom should have
a good exhaust system.  It should have that in any case.


                  Conservation DistList Instance 4:10
                  Distributed: Friday, August 17, 1990
                        Message Id: cdl-4-10-002
Received on Sunday, 12 August, 1990

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