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UV Security Marks on Chips Question??

I was messing around with an old Ultra Violet light I had with a few chips. This is something Greg Susong had an interest in. To my surprise some ordinary looking roulettes had a UV mark. My question is, How do casinos view these marks on the chips. Can they see the UV marks in play or do they just check their inventory from time to time? Here's a couple others with different markings.



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UV Security Marks on Chips Question??
Just some interesting history ~~~
Radio Frequency Identification - RFID
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