We have a chilled film storage unit which was purpose built for our archive to specifications recommended for moving image and sheet film. Aetate sheet film negatives have been stored in Micro Chamber boxes for over 15 years in this 300 cubic foot unit. Temperature and RH have varied over the years but set points are 50F and 35% RH. We are an active research archive so the vault is accessed weekly and film boxes are staged in Styrofoam coolers for 24 hours prior to use. Our AD tests on random samples indicate film deterioration at level 1. We are experiencing a buildup of vinegar/acetic acid vapors in this chilled vault. I have not come across reference in professional literature that indicate ways to actively or passively remove the odor of off gassing. I understand freezing temperatures would be best for the film and to further reduce off-gassing, but this is not a capability of our vault. I also understand specifications for these units did not include ventilation as a necessary feature. A theory based on the idea of level 1 deterioration in the film, is that the Micro Chamber storage boxes are actually off-gassing the vapors they have trapped over the years. Acetic acid vapors are damaging to the general environment but can also cause further damage to dyes in color film. Are there other institutions experiencing a buildup of vapors in the closed environment of a chilled acetate film storage vault, and have you any information about how to passively or actively remove these particular molecules? If zeolite pellet technology is being used I did see a reference to NaX-13X molecular sieve as being the most efficient for acetic acids but do not understand how to efficiently employ it in the space. The other aspect would be to change out our boxes if these have reached a capacity for absorbing off gassing. Anyone willing to share their thoughts or experiences would be appreciated. Thank you! Ramona Duncan-Huse Senior Director, Conservation Eugene and Marilyn Glick Indiana History Center Indiana Historical Society 450 W. Ohio Street Indianapolis, IN. 46202 317-234-0093 [email protected] <[email protected]> Discover more at www.indianahistory.org <http://www.indianahistory.org/>. I was driving the other day... my friend looked over and said, 'You're going 80!.... I said, 'So are you!' --Hank McGill ...and so it goes... ...><((((>`...><((((>`...><((((>
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