What turns vinegar black?

Goldwasher

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May 26, 2009
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Sailor Flat, Ca.
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SDC2300, Gold Bug 2 Burlap, fish oil, .35 gallons of water per minute.
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All Treasure Hunting
Hey Guys I posted a find and thread in a different forum I'm gonna put a link hear to see if I get any other info. There are pictures. I've had it in White distilled vinegar and is seriously reacting. All the material that looks like rock is coming off and turning black, and the vinegar is black. It is not heavy and is a natural item so it is not lead.http://www.treasurenet.com/forums/metal-detecting-gold/432399-interesting-find.html
 

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