Quote:
Originally Posted by Stormer
I am hoping we will get lucky and weather conditions will be such that it turns green for a while before it turns black.
|
I think it will go dark before it goes green.

But a lot depends on any treatments/oil films placed on the copper material, the content of the copper (pure copper vs. copper/tin/zinc alloy) relative sulfur dioxide levels in the surrounding air and relative humidity in the area.
Generally because of our cleaner and more arid conditions it may take a lot longer than the above chart to move into the greens - if it ever does before the supporting structure deteriorates again in 100 yrs.