Quote: So if they're water tight they must by definition be completely air tight
Tell me if I'm wrong, but I believe that air molecules are smaller than water molecules, so even if the slab is tight enough to keep out water, air could get through the cracks. A silver dollar can't fit through a vending machine's quarter slot, but a Half Dime can. Maybe sap in his infinite knowledge can clarify this.
Hmmm, I must have gotten it backwards. What about my arguement of atmospheric pressure though, if the slabs are made to handel depth, would that not block the air molecules at 1 atmosphere?
Now that was the missing factor to my theory jbuck. Thanks. I should have thought about temperature deferentials effecting the seal... Doh... I'm the type that knows a little about sooo much, which can be dangerous. That's why I love ccf, it's a borg-like hive mind!
Air can actually diffuse through plastic. It occurs very very slowly though. I may sit down and try and research how quickly this would actually occur. It would occur extremely, extremely slowly. I'm just not sure if it would be months, years, or millenia.
Even things in our every day lives that are air tight will allow for air permeation over long periods of time. If there are holes in the plastic, or a pressure difference, it would occur a lot faster (think tennis balls, or basketballs).
from locked thread that refers to the PCGS security page:
Quote: Features: Waterproof/airtight (they even prove it with a fish bowl!)
How long was the slab in the fishbowl? The length of the shot? A lot of slabs can do that for short periods, and water tight does not mean airtight. Oh they consulted with structural engineers to come up with the new shell insert fitting one inside the other for the greater structural strength and weld. Was done by Compugrade in 1991.
Quote: QR Code on back linking to cert verification page
Big deal you could always go to the verification website, this just makes it a little faster, and the QR code can be easily copied as well. They say you can go to the site and look at the picture, but most PCGS coins are not imaged. Are they going to start imaging every secure plus slab? Or just the oe that pay the extra $17?
Quote: Reformulated plastic that is clearer and stronger (won't break as easily)
OK, that's good.
Quote: Special additive in the holder that can be detected by a sensor they are selling for $300 (their cost)
Will be selling they say. And I want to see you use it on a coin in an ebay auction. I also wonder how long it will take the counterfeiters to determine what it is the sensor is reacting to? And how many sensors they will sell before the counterfeiters get it figured out. (At which point the $300 sensor becomes worthless.)
Introducing a traceable impurity into the plastic or the label will make it more counterfeit resistant. You guys are right to think it won't be counterfeit proof, but it is another measure they can use.
I don't know what they are using. Is it an alpha particle source? Is it an impurity that affects the conductivity of the plastic? (Probably not. That would cost less than 300 dollars to measure) Is it spectroscopy related?
Virtually impossible to replicate.... You think these companies enjoy when others fake their products? This allows PCGS to ultimately make even more money by selling these new holders.
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Posted 05/27/2015 01:29 am
