--- On Tue, 6/13/17, <[email protected]> wrote:
> ------------------------------ > > Subject: [Consdistlist] consdistlist > Digest, Vol 31, Issue 46: 5. > Cold storage for > nitrate negatives (Amy Minger) > Amy Minger said: > > "We recently purchased a commercial > grade freezer to utilize as cold storage for nitrate > negatives .......runs a defrost cycle every 6 > hours.......The max temperature was recorded as 19.73 > degrees Fahrenheit, and the max RH was recorded as > 92.33%.........how did you address these concerns?" > I think the issue here is having an auto-defrost cycle on your freezer. The freezer will cycle through higher temperatures in order to get rid of frost build up, which in turn will cause changes in humidity. You are better off not having a defrost cycle on your freezer and only defrosting it manually when it becomes necessary. If you have a freezer that keeps a steady temperature (i.e. Non-self defrosting) at -20 or below, it will be better for the artefact and more stable with the humidity. If possible, you might want to disable the auto defrost function. If you have lower humidity in the room that the freezer is in, you will get less frost build up, and have fewer maintenance days defrosting the freezer. That's my 2 cents. Valerie Tomlinson Conservator Auckland Museum ****** Unsubscribe by sending a message to [email protected] Archives through August 2016 at http://cool.conservation-us.org/byform/mailing-lists/cdl/ Archives from September 2016 onward at https://www.mail-archive.com/[email protected]/
