Yes, that would catch imitations of coins in PCGS's database, but only if the imitation was submitted for gold shield service. This service is...
What's really needed is for all submissions sent in above the economy/modern level to be scanned into a shareable database. All scans of new...
Nice work! Have you notified the TPG that certified the fakes? Little surprising the counterfeiter would choose this coin. Only 7 are believed...
Below is Weller's description of a glass brush. I think where he mentions thickness, he's writing about the bundle of fibers, not single fibers....
Advice below is from Cleaning and Preservation of Coins and Medals by Gerhard Weller. Cal [ATTACH]
The New Roach is one of my favorites. This coin has really pretty toning. Cal
Be sure you go to a fabricating jeweler ... one who actually makes jewelry. Some of these folks can do amazing work. Most jewelry stores can't...
I don't think I've missed your point. I was just correcting a misstatement. Of course, the sniffer can do more than XRF because it incorporates...
I wonder if my late in-laws might have used them. He was in the Coast Guard in WWII. Mostly involved in convoying freighters and troop ships...
Doug, You posted the following link: https://www.pcgs.com/news/pcgs-coin-sniffertrade-uses-advanced-technology-to-detect-doctored-coins Here's...
Doug, If you read the PCGS article on the sniffer, it describes energy-dispersive X-ray spectrometry (EDX) as one of the techniques it uses. EDX...
Well, not a gun, but sure, there are instruments like IR spectrophotometers (it's part of the PCGS sniffer) and gas chromatography that will...
Most chemicals used in cleaning don't leave behind detectable residue (assuming the coin is properly rinsed and dried after cleaning). It's the...
John, Nicely done! What was the issue price of the 5-coin boxed set? And yeah, I'll get me one ... like never! Cal
Doug, Nice to know that. Thanks. Cal
Yes they can. They just need to spend the money to do it. Cal
To lead off: pics of my Pan Pac gold dollar. PCGS MS63. Foggy areas in pics are due to an etched slab. I'll get it a new suit someday. :)...
The PCGS sniffer is a trade secret. It is known that it uses multiple modalities of analysis (X-ray spectrometry, FT-IR, Raman spectrometry and...
I think it comes down to bottom-line accounting. If PCGS sniffed every coin, they would have to raise prices to pay for it. This would make them...
Gold Shield is only an extra $5. In addition to the coin getting sniffed, the coin is laser-scanned so it will be uniquely identifiable in the...
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