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Re: Replacing mirrors

 this is water/salt induced corrosion of the metallizing
>compound ( it's probably not silver).

Stainless, sputter coated in a vacuum chamber.  Normally layers of 
silicon would be sputtered on to protect the metal from the salts in the 
glass and environment.  Perhaps they decided to save $ or had some 
perfectly good reason to leave it off (thermal conductivity?).  I mostly 
worked with LCD glass.  Moisture creeping into the edges interacts with 
the minerals in glass to corrode coatings.


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