As yet unmentioned is the use of such bags for flat things in files.  If you
have to use them for items in a file, cut off the zip-lock strip or it will
made a dent in all the other items in the file.  I know it seems like a 'no
brainer', but I have frequently found just that in some small museum
archives.

Lucy Sperlin

-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]] On Behalf
Of Tracie Evans
Sent: Tuesday, October 31, 2006 2:11 PM
To: [log in to unmask]
Subject: Re: Archivally safe bags

Cathy,
My understanding is that food safe bags are required to be manufactured
from polypropylene which means they are safe for objects also.  They are
however not make of a very thick polypropylene and therefore do not
always give the support that the higher grade archival bags do. I also
always avoid bags with "write-on" labels, printing, etc. since I don't
know if they are safe.
With any bag, you must monitor them for condensation and other issues. 

Hope this helps,

Tracie Evans 
Collections Manager
Texas Ranger Hall of Fame and Museum

-----Original Message-----
From: Museum discussion list [mailto:[log in to unmask]] On
Behalf Of cathyosterman
Sent: Tuesday, October 31, 2006 12:10 PM
To: [log in to unmask]
Subject: Archivally safe bags

Hi all,

Does anyone know if Ziplock brand bags are archivally safe?
I attended a workshop on textile preservation and was told
that as long as a bag was Ziplock brand that it was OK to
use. Is there any truth to that? With all of the new bag
sizes out there, it seems like a nice, cost-effective
solution for some of our storage needs even beyond textiles.
Can Ziplocks be used only with certain types of artifacts?
Are there long term effects I should be aware of? Should the
bags be totally sealed if they are OK to use? 

Thanks in advance!

Cathy Osterman
Curator of Collections
CFD Old West Museum
Cheyenne, WY

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