In a message dated 97-03-30 00:41:32 EST, you write:
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Dear Kari:
Sorry I don't have a good answer about where to find eisenglass, but I can
tell you more about it. It isn't plastic, but a mineral known as mica which
comes in sheets. It withstands high temperatures and was used in cookstoves.
I believe the name is German and means "iron glass."
Matt Mayberry
Colorado Springs Museum