[ATM] Does exposed Pyrex lose polish over time?

["Bill T." <twentiethwave@hotmail.com>]

Hello all, been away for a while.

It’s spring and time to think of telescope making again after an 18 month 
hiatus.  So I’ve got this 20” Pyrex mirror with a nice, uncoated figure 
that’s been stored face up in the shop for 1.5 years.  A quick rinse and it 
looks good as new.  I want to send it to the coater.

Now I know the answer is almost certainly a resounding “NO,” but I was 
wondering if the bare Pyrex might have lost a bit of shine in this idle 18 
months of direct exposure to the atmosphere.  What think you?  Does Pyrex 
oxidize, or react with the airborne products of human respiriation, smog, 
gas heaters, swamp coolers, air pumps, dust, etc?  Which of these might be 
harmful, and over how much time?

I’m feeling a strange compulsion to make a lap and give it a few polishing 
swipes, but you all know what that can lead to...please help me avoid this 
stupid mistake!

Bill T.

_________________________________________________________________
>From must-see cities to the best beaches, plan a getaway with the Spring 
Travel Guide! http://special.msn.com/local/springtravel.armx

_______________________________________________
ATM mailing list http://www.atmlist.net/