Re: [ATM] Does exposed Pyrex lose polish over time?

[Raidoflostdark@aol.com]

I had an enteresting experience with a piece of pyrex once. I was in the 
figureing stage of a 6" mirror that I had been placing face down on a paper towel 
that was laid ontop of a plastic coffeee can lid. I was kind of fond of this 
storage method because the mirror fit into the lid and paper towel so well.  I 
liked the way the lip on the lid seemed to protect the edge of the mirror.

I had no problem until I was in a hurry once and put the mirror onto the 
towel slightly damp.  Next day on the tester, there appeared  a very narrow 
circular zone that perfectly matched the diameter of the raised center area of the 
lid.  This was the radius where the contact on the surface was. Washing 
couldn't touch it. It took about 1/2 hour to polish it out.

This was an early mirror where figureing was all over the board and back. It 
had been polished out weeks before this occured!.

Virgil Johnson
Raider of the Lost Dark
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