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How long to tell if glass is not compatible?
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2018-07-25, 6:16pm
Three Muses Glass
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Join Date: Jun 23, 2005
Location: Up and down I-95
Posts: 4,390
You can make a cheap polariscope. Here's one how-to
http://www.davebross.com/GlassTech/polariscope.html
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