This is a resource post. Please add comments describing any useful information about conservation materials or techniques. Links to other online resources are welcome, especially if you say a word or two about what is available at that resource. Links can also be to Art and Perception posts with relevant information. If the information is in a comment rather than the main post, please link to the comment, which can be done by copying the link under the comment date (or the name of the commenter from the sidebar comment section).
[This information is thanks to Jay Hoffman. Jay, go ahead and add a comment in whatever form you like, and I will then delete this example comment. Thanks!]
While scanning through posts and comments I remember coming across a question about preservation. It was only later that I recalled a local institution, The Intermuseum Conservation Association 216-658-8700, that deals with such issues and will discuss over the phone.
It’s true. It’s all true. Called them some time ago to get a reading on pink insulating foam as a medium. A hand-over-phone discussion ensued and I was then informed, on the best authority, that the insulating foam is chemically stable. Been using it ever since for most everything short of brushing my teeth (the foam, not the Association).