Hi TechNet - I had promised some time ago to pass along a paper reference
on copper surface degradation for indoor exposures for a 49 year period.
That reference is:

"THE SURFACE COMPOSITION OF COPPER WITH INDOOR EXPOSURES RANGING FROM 3 TO
49 YEARS"

authors: Schubert and D'Egidio     Corrosion Science vol 30 no 10 1990

Happy Reading!

Dave Hillman
Rockwell Collins
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