I didn't recall hearing of this security terminology before. Here's what GPIs site says about it:

In keeping with the Company's long-standing tradition of providing the world's casinos with high quality table game products and security-focused currency solutions, GPI will release the following new currency security features that can be added to any of the Company's well-known chip brands:

UV-4C. An innovative application of ultra-violet security protection, UV-4C uses a standard UV detector to reveal a unique full-color photo or image hidden in the chip decal.

SecuriTagg®. A covert taggant that is revealed by a specialized hand-held tool, SecuriTagg® includes a unique code that can also be forensically authenticated by a lab, providing an even higher level of authentication.

Holographic MicroDots. Available as both an overt or covert security feature, MicroDots are miniscule hologram particles that can be added to decal printing inks or incorporated into transparent chip materials. (note that the two samples Gene showed have transparent areas)

MicroBeads. Another covert security feature, MicroBeads are added to chip decals to reveal a series of bright red beads. Using an easy-to-use proprietary device, MicroBead markings are easier to authenticate than micro-text, reducing the amount of time required to determine if a chip is real.

Can anybody show a scan or photo of what these look like when subjected to the appropriate test?

There's more info at this link, although it's dated 2012 and probably doesn't include all the latest from GPI.

http://gpigaming.investorroom.com/index.php?s=43&item=105