Storage of nitrate negatives

The National Library is considering vacuum-sealing cellulose nitrate
still-camera negatives for storage in appropriate freezers.   Does
anyone have recent experience with this method?   We would also like
advice on the most appropriate packaging material and whether
double-sealing is advisable.

We are looking at vacuum-sealing because of difficulties in
maintaining a controlled environment in our designated storage area.

Chesley Engram
Preservation Services
National Library of Australia

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                  Conservation DistList Instance 12:9
                  Distributed: Thursday, July 9, 1998
                        Message Id: cdl-12-9-014
                                  ***