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Re: [ATM] How to test a mirror blank?

Aaron,
   
  Fused Quartz is invisible to IR. Set it in the sun besides a known comparable blank of Pyrex etc. The Quartz blank will remain cool to the touch while the Pyrex etc will increase in temp dramatically compared to the quartz.
   
  Ken Hunter

Aaron L Taylor <lists@subgeniuskitty.com> wrote:
  Do you guys have any more reliable methods to verify what this is 
made out of? Are there any other glasses that could have a similar color 
that I should know of?

Thanks,
-Aaron Taylor
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