[TowerTalk] Black fungus on copper wire

[Donald Chester]

I have noticed for several years now, that my copper-clad open wire feeders 
accumulate a black crud that looks exactly like soot.  You can rub it off 
with your fingers. Apparently it is some kind of fungus growth.  I suspect 
it is the same stuff that grows on asphalt roof shingles around here and  
leaves unsightly black streaks on the roof.  It doesn't grow on the 
galvanised tower sections or guy wires, or on the insulators.  Sections of 
the roof subjected to runoff from galvanised flashing remains fungus-free.

Wonder if anyone else has observed this phenomenon?  I don't think it 
actually causes any harm to the performance the antenna or deterioration of 
the structure, but I am curious if anyone else has noticed this on their 
antennas.

Don, k4kyv

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