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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

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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

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