Maybe give a magnet a try!
Mark Shakarjian
Sent from a device you don't need to know about
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On Apr 23, 2012, at 12:36 PM, John Dawson wrote:
Hi everyone,
I was wondering if anyone had tips/resources about determining whether or not a the substrate of a laquer is steel or aluminum. I have some WWII era discs and some are definitely heavier and sturdier than others. I am wondering if these are steel.
John Dawson
Indiana University
Media Preservation Initiative
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