This is a message from the Museumpests List. To post to this list send it as an email to pestlist@museumpests.net To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hi again,
So then there is a need to bring objects back to room temp slowly. The rented freezer is getting picked up on Monday, so I'll need to unpack it on Sunday. There is a thermostat on it. I've had it cranked down all the way which has yielded -30c. I can gradually warm it up over time while keeping an eye on the temp. So, my question is, over how long a period is "Allow them to come up to the ambient temperature slowly?" 5 hours? 24 hours? Neil On Aug 24, 2012, at 10:40 AM, Anderson, Gretchen wrote: > This is a message from the Museumpests List. > To post to this list send it as an email to pestlist@museumpests.net > To unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > Hi Neil. > When you remove your package from the freezer, it is best to allow it come up > to ambient temperature as slowly as possible. This reduces the thermal shock > to the object. Ideally the object should be placed in a refrigerator until it > is thawed then move it to the room. I realize that this does not always > happen - it depends on your facilities. But the goal should be to bring the > objects up to room temperature as slowly as is feasible. > > You are creating a micro-environment to protect the item. If you have placed > your objects in a double layer well sealed plastic you will not have a > problem with condensation or see any evidence of localized relative humidity > on the piece when you remove it from the freezer. Allow them to come up to > the ambient temperature slowly and when they are completely acclimated you > can remove them from the plastic. You will not have a mold problem. > > It is a good idea to examine the object and maintain quarantine until you are > sure that the object is pest free. One way to do this is to keep it in a bag > for a while (length of time will depend on the life cycle of the pest > species). > > Anoxic is another topic. With this method you are actively removing the > oxygen from the bag or space around the object. There are advantages to this > method, and there are some things that are best stored and displayed in an > anoxic environment. But that is more complicated. For use of anoxia in pest > control , take a look at the various strategies on Museum Pest Net > http://www.museumpests.net/treatment.asp There is also a fact sheet on > bagging for isolation. > > Good luck! > Gretchen > > > > -----Original Message----- > From: ad...@museumpests.net [mailto:ad...@museumpests.net] On Behalf Of Neil > Carey > Sent: Thursday, August 23, 2012 8:50 PM > To: pestlist@museumpests.net > Subject: [pestlist] Defrosting > > This is a message from the Museumpests List. > To post to this list send it as an email to pestlist@museumpests.net To > unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > Since implementing IPM a month ago, we've been successfully freezing our > ethnographic collection of mostly wooden African pieces, many with textile, > feather, or metal attachments, at -30c. Thanks to the group for all their > valuable input. > > However, I don't recall any discussion about controlling the defrost cycle. > Are there any special considerations? Off hand, I can think of the > possibility of mold growth if an object is kept double wrapped in > polyethylene after defrosting, despite being wrapped in tissue paper. Am I > overly paranoid? Just how long should a controlled defrost take? Must the > object be removed immediately? If not, how long can it go heat sealed in > bags? It's not like anoxic treatment where a piece can just be kept inside > its polypropylene bag forever. Any input? > > Neil Carey > > ---------------------------------------------------------------------- > To send an email to the list, send your msg to pestlist@museumpests.Net > > To unsubscribe from this list send an email to pestlist@museumpests.net and > in the subject put: > "unsubscribe" - no quotes please. > > You are receiving the Pestlist emails in standard mode. > To change to the DIGEST mode send an > email to imail...@museumpests.net with this command in the body: > > set mode digest pestlist > > Any problems email l...@collectionpests.com or l...@zaks.com > > > The information contained in this message and/or attachments is intended only > for the person or entity to which it is addressed and may contain > confidential and/or privileged material. Any review, retransmission, > dissemination or other use of, or taking of any action in reliance upon, this > information by persons or entities other than the intended recipient is > prohibited. If you received this in error, please contact the sender and > delete the material from any system and destroy any copies. Any views > expressed in this message are those of the individual sender. > > > ---------------------------------------------------------------------- > To send an email to the list, send your msg to pestlist@museumpests.Net > > To unsubscribe from this list send an email to pestlist@museumpests.net and > in the subject put: > "unsubscribe" - no quotes please. > > You are receiving the Pestlist emails in standard mode. > To change to the DIGEST mode send an > email to imail...@museumpests.net with this command in the body: > > set mode digest pestlist > > Any problems email l...@collectionpests.com or l...@zaks.com > ---------------------------------------------------------------------- To send an email to the list, send your msg to pestlist@museumpests.Net To unsubscribe from this list send an email to pestlist@museumpests.net and in the subject put: "unsubscribe" - no quotes please. You are receiving the Pestlist emails in standard mode. To change to the DIGEST mode send an email to imail...@museumpests.net with this command in the body: set mode digest pestlist Any problems email l...@collectionpests.com or l...@zaks.com
