As I recall my chemistry which was a long time ago, It shouldn't be a fungus
as copper is used, or rather was used in some very strong fungicides.
it's more than likely an oxide. As I recall sulfides and chlorides will be
greenish. and if it's down wind from a chimney all bets are off as to what
compound is forming although that would most likely produce some
copper/suphur compound.
Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com (Use return address from home page)
>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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