The Exhibit I set-up at the Convention was more for the naked-eye than it was for the camera. As pointed out by Brian, Greg has some good examples on ChipGuide. I would add (for Mark and other Newbies) that UV tagging is sometimes done to show chip manufacturer (as is the case for Paul-Son using the hat and cane logo, Bud-Jones using the stylized "BJ" initials, which is also used by BetG with a "BG". Blue Chip (BCC) uses a sun image with a hole, maybe it's a ring with pointy spikes.

On higher denomination chips UV tagging can easily become a function of a security (anti-counterfeiting) feature. Some casinos tend to use UV inks to enhance the artwork of the chip. For example, all of the Palms casino Chinese Lunar New Year chips use UV inks as part of the artwork. Sometimes a casino likes to use it's name as the UV tag, and sometimes the parent holding company name or initials are used.

There can be a lot of reasons for UV tagging, but armed with a good UV light, it makes for an interesting trip through ones collection.

Barry, the UV light I was using was the kind used to erase EPROMs.

Jim