any way this is a cob?

[jefg231]

1682 reale was found in area

 

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[stevemc]

Do some cleaning to see what you have. Use vinegar if you dont want to go too fast, might take forever, or get some pool cleaning muratic acid and cut it 50% with water. Drop it in for a while maybe 15 minutes and check it. Silver wont get eaten by muratic acid. Rinse real good after.

 

[Diver_Down]

Do some cleaning to see what you have. Use vinegar if you dont want to go too fast, might take forever, or get some pool cleaning muratic acid and cut it 50% with water. Drop it in for a while maybe 15 minutes and check it. Silver wont get eaten by muratic acid. Rinse real good after.

Good advice, Steve. Remember "AAA" - Always Add Acid. Never pour water into acid. Always pour acid into water.
Do the cleaning in a well-ventilated area as there will be fumes. Outside is best.
I also use baking soda to neutralize the acid. Make the baking soda into a paste and rub it over the surface of the coin, it will neutralize any residual acid and serve to polish the dull gray color.
You can go one step further by neutralizing the acidic solution by adding baking soda. Add enough until there is no more reaction.

 

[stevemc]

jefg231 did you ever clean it? What I do instead of diluting and throwing away the acid, is use a tight fitting plastic container and lid and use that to clean and keep the old acid. After a few cleanings it gets real dirty then I will dilute it and get rid of it. If you clean iron with acid, dont clean other metals at the same time, as it might stain things. Also if you do clean iron, do use baking soda and plenty of water to rinse as iron will react with acids. The acid will take off the rust, but if left for too long it will eat the iron some. I use it for water cooled marine iron exhaust manifolds and elbows to get rid of rust inside, when they start getting bad.

 

[jefg231]

Yes, thanks, I did clean it with some hydrofluoric acid that I had at the office. It became obvious that that the main ingredients lead. After careful examination under magnification I realized there was a seam and an area that resembled a hinge. It is my opinion that the object is a bail seal. Thanks for the tips on the electrolysis. I have a few of my past treasures soaking. My wife loves this new concept of rusty jars strewn about the kitchen.