Strange Weather

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Bizarre geometric weathering patterns resembling crop circles on the chain link fence of bemused Twitter user @Ben_On_The_Moon, who has been photographing the phenomenon for years, as yet unable to discover the cause.

Which is witchcraft, obviously.

Or, according to astute commenter, Barry the Hatchet…

colossal

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10 thoughts on “Strange Weather

  1. Jeffrey

    Listed from Reddit:

    Definitely looks like a metallic patina.

    This is not galvanic corrosion as 2 different metals need to be in contact with each other for that to happen, which I don’t see in the photo.

    Copper Oxide being the black areas and Copper Sulfites, Sulfates, Carbonates and Chlorides being the green.

    Where the copper came from I have no idea. Perhaps it was leached out of the alloy the fence is made of.

    There is also Green Rust which is the same thing I listed above except replace the Copper with Iron so; Iron Oxides, Sulfates, Chlorides, etc. This is the much more likely scenario.

    Mix in some anaerobic bacteria making their home in the porous compounds and you got yourself a lovely patterned patina.

    Source: Am metallurgist.

    1. Knarf

      Unlikely… The fence would be plasti-coated green and it is the degradation of the green laminate that is causing it… Possibly u.v. ??

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