Hi George,

It depends on what kind of glue it is. If it's still sticking to metal
after some time, then it's probably not PVA. Hardened Gum Arabic and
other natural mounting glues like Casein would probably fall off if you
dropped the coins into boiling water for a moment. You might also try
ultrasound, in a bath of warm water. 

PC. 



Paul Callomon
Collections Manager
Malacology, Invertebrate Paleontology and General Invertebrates
Department of Malacology
Academy of Natural Sciences
1900 Parkway, Philadelphia PA 19103-1195, USA
Tel 215-405-5096
Fax 215-299-1170
Secretary, American Malacological Society
On the web at www.malacological.org

>>> George Harris <[log in to unmask]> 4/24/2007 2:21 pm >>>
Hello,
I have just gone through a couple thousand coins and many of them have
glue on one or both sides from when they were glued to something in an
exhibit.  Does anyone know of an archivally safe way of removing this
glue?  Some of it has come off easily with some slight proding, but
much
of it is still seriously glued and scraping it off would most likely
result in irreversable damage to the coins.

Thanks.

Beau

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