i bought a coin from someone for half the spot price and i toke it to my coin dealer and did a electric test on it and now there is a darker spot on the coin from the pen of the tester, how can i get rid of this dark spot? is it because its 22k and the other metal is burnt or something?
A coin dealer employed destructive testing on a coin to determine if it was the correct alloy??? I would not return to that dealer if I were you.
Well, I probably would return and ask them what the fluff they did to my coin. And then never let them touch a coin of mine again.
Good luck. I don't know of anything that will remove it. Yes it's an electrical burn mark. Even a .9999 gold coin would show the same burn mark.
Strange they should have been able to do a density and find that out, heck most jewelers can even pick up a gold coin and tell if you it is gold (because of a density gold has if you put it on your palm and move up and down you can feel it pushing down ).
I am a little confused on the "electric test" the dealer did with a pen type device. Generally these do not damage the metal. They are used on expensive settings by jewelers and can not leave a permanent mark, and generally are small battery operated and won't generate enough heat to do anything to the metal. Did you watch the procedure, or is there a chance he used acid solutions to determine the gold content, which would leave a mark. If it is a "burn", or any mark, I would use some acetone, just in case it is a plastic mark, and if not either leave it or try an eraser sharpened to a point to gently see if you can remove it the stain. That will also leave visible evidence, and should never be used on a coin with other than metal value, unless it is a partial loss anyway. Possibly if the dealer knew what you paid for it, perhaps they assumed it was just bullion and that they might end up with it and tested it "real well" with acid. IMO. Photo would be interesting.
If he was a real coin dealer, he would not have used this method to determine if it was gold or not. A density test would have been the ideal way to determine if it was gold or not. Burn marks can't be removed to the best of my knowledge.
