What is the gold sheen on the water?

On some still ponds in an area  which was used for military training during WW2 and then became a clay pigeon shoot, a gold sheen appears during the summer months. It disappears when disturbed only to re-appear if left alone. I have not seen it anywhere else.  It could be that material was buried here at the end of the war which could provide a special environment due to leakage, of, for example, phosphorous, which I know was used to make anti-tank bombs. I suspect a micro organism of some sort but what?

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One thought on “What is the gold sheen on the water?”

  1. I think this could be due to iron oxidizing bacteria. A petroleum based pollutant would flow together when disturbed rather than breaking up. And bacterial sheens are often rust colored.

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