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We currently use anoxia treatments on an as-needed basis using Mavelseal bags we make to the size needed, and Ageless ZPT-2000. We have needed to treat less than 10 objects in the last year, most with multiple materials, including feathers, and some archaeological wood. We no longer include indicators- they are unreliable- but with the small size of most of our bags/anoxia chambers it’s possible to observe the 20% reduction in volume within the first 24 hours. I have used a Hobo inside the bag to record changes in RH as well. The RH will drop by a small percentage but NOT to zero! I have used acid free tissue paper as an RH buffer as well as for surface protection, and have used silica gel for larger volume or more vulnerable objects. This is a reliable if limited solution- it is slow and it cannot be monitored exactly, but is effective and cost effective for our needs.. We are considering a freezer and have access to a tent-system if a larger scale treatment is ever needed. Casey From: pestlist-ow...@museumpests.net [mailto:pestlist-ow...@museumpests.net] On Behalf Of Nicole Grabow Sent: Tuesday, November 28, 2017 2:04 PM To: pestlist@museumpests.net Subject: [pestlist] Anoxic treatment This is a message from the Museumpests.net List. To post to this list send it as an email to pestlist@museumpests.net<mailto:pestlist@museumpests.net> To unsubscribe look at the footer of this email. ----------------------------------------------------------- I have a couple of questions about anoxic pest treatments using oxygen scavengers. I more commonly use low-temperature treatment and I'm more familiar with that technique, but I understand the anoxia is recommended for laminate structures and painted wood. My first question is about oxygen indicators. I know that the Ageless indicators are prone to failure, but more sophisticated instrumentation is expensive. I have received quotes for both the MOCON OpTech Model P and the PreSens Fibox 4, but at over $5K they are out of our budget for this fiscal year. Does anyone have a less expensive solution, or, alternately, equipment that we could rent for a singe project? My second question has do to with the basic premise that anoxia is safer than freezing, and the basis of my concern is relative humidity. With anoxia induced by oxygen scavengers (which is the system I have available to me) the RH ultimately goes to 0% - or else the scavengers aren’t working. 21 days of this does not seem safer than 72 hours of freezing - what am I missing? Nicole Grabow ------------------------------------------------------------- To unsubscribe from this list send an email to imail...@museumpests.net<mailto:imail...@museumpests.net> and in the body put: "unsubscribe pestlist" Any problems email l...@zaks.com<mailto:l...@zaks.com> ------------------------------------------------------------- To unsubscribe from this list send an email to imail...@museumpests.net and in the body put: "unsubscribe pestlist" OR just send an email to l...@zaks.com and ask to be removed. Any problems email l...@zaks.com