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. ----------------------------------------------------------- Thanks Em,
Good to know. Neil On Aug 24, 2012, at 12:00 PM, Kaplan, Emily 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 all, > We routinely treat collections with low temperature at minus 30 degrees C and > have had no problems with unloading the freezer and allowing the collections > items to come to room temperature - 24 hours minimum to be on the safe side > (we do not use a refrigeration step.) Just make sure you keep them wrapped > until they come to room temp so any condensation occurs on the wrapping not > the object. > Best, > Emily > > > Emily Kaplan > Conservator > Smithsonian National Museum of the American Indian > Cultural Resources Center > 4220 Silver Hill Rd Suitland MD 20746 > 301.238.1418 fax 301.238.3201 > kapl...@si.edu > > > -----Original Message----- > From: ad...@museumpests.net [mailto:ad...@museumpests.net] On Behalf Of Neil > Carey > Sent: Friday, August 24, 2012 11:19 AM > To: pestlist@museumpests.net > Subject: Re: [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. > ----------------------------------------------------------- > 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 > > > > ---------------------------------------------------------------------- > 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
