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Re: A novel material for mirror AH ?
From: Igor S.
Date: 2019 Aug 16, 12:57 -0700

Hi Tony,

You are absolutely right! Some time ago I've bought a set of welding glasses starting from shade #9 till shade #14 and non of them are flat, although it looks like. Moreover the sun image is a lot more brighter than that from my photo with soot.

kind regards,

Igor

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