Yes. Somehow I missed the part about the acetone bath. But I couldn't follow your comment about "small chem bath" -- it sounded like you were...
Um, I think you're on a different channel from the rest of us. The first images were from the seller, done on a scanner, not a camera. The second...
http://www.sigmametalytics.com/information.html I'll admit that I'm thinking mostly about induced current and back EMF, not direct B-field...
Yeah, I'm not sure you need more light/brightness, because the highlights on the coin already look like they're saturated. The white holder will...
That poor thing... :(
At this point I think that dateless Buffalos heavily outnumber dated ones, so you could make the argument that "average circulated" means "no...
Because how many would they sell if they didn't say that? If all they're sending through the coin is electromagnetic waves, I want to see how...
The "dimensions" part is important. If it's a foreign or underweight silver planchet, it should be thinner than expected, and the design should be...
It's funny, a new member just started a thread about a quarter weighing 5.7g that a Sigma machine "verified" as 90% silver. I'm ready to argue...
Okay, here's one thread mentioning Sigma Metalytics: https://www.cointalk.com/threads/sigma-metalytics-modern-5-half-eagles.296929/ I thought...
Something icky got stuck on it, the rest of the coin toned, then the icky stuff came off. That's my scientific analysis. ;)
I absolutely would not trust a Sigma to distinguish between a 90% silver coin and a clad coin plated with .999 silver. Given the skin effect, and...
Yeah, I'm tall enough to reach the top, but I get self-conscious enough just cruising by and gawking at the reject bin. Plus, it ain't getting any...
Fine, I'll go dig around for the thread as I should've done in the first place. :rolleyes: :shame:
Yeah, the whole "If I buy this it's going to sit in the shop for a long time" trash-talk would be kind of embarrassing for them, I'd think. :)
Can you elaborate on this? Because if it looks silver (solid silver edge, looks light rather than dark when viewed through paper), but weighs 5.7...
Bingo. The resistance of a silver coin will be somewhere in the micro-ohm range. That means that if you push a full amp through the coin, you'll...
"Unc Details, ultrasound transducer gel residue". :rolleyes:
Have you ever tried this? You'll find that if you "just touch" the coin with the probes, you'll be touching surface contaminants (dirt, oil,...
I just meant that poking the coin with metal probes is likely to scratch it. You generally must push quite hard to get good electrical contact for...
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