A large portion of the discoloration I see has got nothing to do with the metal, which is normally a genuinely latent aluminum shrouded in aluminum oxide. What seems to happen a considerable amount is flying creatures sit on the aerials and simply do what falls into place without a hitch - abandoning somewhat of a stain. I put in a couple of years adrift and saw a gooney bird perch on a pivoting radar elevated medium-term. The following morning the deck underneath was a wreck of semi-processed fish, an enormous sum for only one winged creature!
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SOURCE: Why are roof tiles, under TV aerials, discoloured on most roofs?
Most
of the discolouration I see has got nothing to do with the metal, which
is usually a fairly inert aluminium covered in aluminium oxide. What
does seem to happen quite a lot is birds sit on the aerials and just do
what comes naturally - leaving behind a bit of a stain. I spent a few
years at sea and saw an albatross roost on a rotating radar aerial
overnight. The next morning the deck underneath was a mess of
semi-digested fish, a huge amount for just one bird! Here you will get
more information about aerials.
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