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...
Yup would be great to see more PLs and DMPLs. However, PCGS gives no extra credit in the registry for it ... so it's no upgrade to them. A MS65...
Congratulations! Terrific set. Pleasure to look at. I know it took a lot of work ... but probably pleasurable work. Cal
Then it's polyester resin. Should be detectable by the "sniffer" for months or even years after it's applied. Cal
What's the putty made of ... chemically? Would the "sniffer" detect it for gold shield service? Cal
Could have edge problems too ... something we can't see. Cal
I think I can resist the Columbians (for a while). But the Pan Pac and American Sesqui quarter eagles are calling ... pricey though. Then there...
The classic commemoratives may hold their value (I'm not predicting it) ... moderns probably won't beyond bullion value if of PM (I am predicting...
Problem is a lot of air cargo used to ride in passenger jets … that’s hugely decreased. Air freight companies have had nowhere near enough...
finis argumentis ab me
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