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I'm guessing the flooding has something to do with it.

I've noticed more black anchor occurrences since then.

I'm guessing the heavy sediment load has dropped the dissolved oxygen near the bottom, where this has settled, lower than usual. That explains the black anchor (bacteria metabolize sulfate in waste and seawater generating hydrogen sulfide, which turns iron black Iron(II) sulfide - Wikipedia, the free encyclopedia) and the bubbles (mostly methane and CO2 I'm guessing--if there had been sulfide you would have smelled it--methane is less water soluble than CO2 or sulfide).
 

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Please, leave the stain alone

Air will gradually change it back, as the sulfide re-oxidizes. Anything you do to speed the process will cost you zinc. Yup, I've gotten black chains more than once.

It just proves you're not a dock princess. Wear it as a badge of courage.
 
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