What Is This Damage? - Coin Community Forum

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Author	Replies: 6 / Views: 1,531
rockfish Valued Member Canada 217 Posts	Posted 04/30/2017 2:32 pm 1860 Frankfurt thaler. But what is that black stuff? Looks like more than just toning/tarnish. Fire damage? Love my coin, and usually love toning, but hate the black stuff. thoughts? Report this Post to the Staff

RoyCoinBoy Pillar of the Community United States 1609 Posts	Posted 04/30/2017 3:14 pm Yeah, looks like some unattractive toning to me. Report this Post to the Staff
SHAFTA9a Bedrock of the Community Canada 10743 Posts	Posted 04/30/2017 5:28 pm Carbon spots. Report this Post to the Staff
Dorado Bedrock of the Community Canada 24885 Posts	Posted 04/30/2017 9:46 pm I call that tarnished Possibly the coin was in a coin holder, the protective film was not intact, letting air pass through certain places. The copper in sterling, when it comes in contact with oxygen, tends to create the darkening effect that ruins the look of many pieces. I had this bad experience with many coins. In the future check your coins holders. Edited by Dorado 04/30/2017 9:47 pm Report this Post to the Staff
rockfish Valued Member Canada 217 Posts	Posted 05/01/2017 09:28 am I know this is heresy, but do you think a diluted thiourea quick dip would get rid of it without stripping the rest of the patina? I'm thinking 2:1 water to dip solution. Report this Post to the Staff
Conder101 Bedrock of the Community United States 17884 Posts	Posted 05/01/2017 10:11 am Well since the dip will attack the toning at the same rat everywhere, the first thing to go will be the lighter attractive toning and it will all be gone before the heavy dark toning on the back lightens up. Report this Post to the Staff
Dorado Bedrock of the Community Canada 24885 Posts	Posted 05/02/2017 8:28 pm I found the perfect example : (storage flip replaced) Report this Post to the Staff
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